Koncentracija raztopin je osnova kemije, s katero se srečaš povsod... Show more
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Updated Apr 16, 2026
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Kako izračunati masni delež topljenca v raztopini
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Osnove koncentracije in masni delež
Verjetno se sprašujaš, zakaj se sploh ukvarjati s koncentracijo? No, predstavljaj si, da pripravljaš slano vodo za cmok - preveč soli in bo nečimrno, premalo pa ne bo učinkovito.
Koncentracija nam pove, koliko topljenca je v določeni količini raztopine. Masni delež (w) je eden najpreprostejših načinov za izražanje koncentracije - pove ti, kolikšen del celotne mase raztopine predstavlja masa topljenca.
Najprej moraš razumeti tri osnovne pojme: raztopina je homogena zmes (npr. sladka voda), topilo je snov v presežku (navadno voda), topljenec pa se v topilu raztaplja (sol, sladkor). Ključno pravilo, ki ga ne smeš pozabiti: masa raztopine je VEDNO vsota mase topljenca in topila!
💡 Nasvet: Masni delež je kot delež čokolade v piškotu - pove ti, koliko celotne teže piškota predstavlja čokolada.
Formula in izračunavanje masnega deleža
Osnovna formula za masni delež je preprosta: w(topljenec) = m(topljenec)/m(raztopina). Masni delež je decimalno število med 0 in 1, vendar ga običajno izražamo v odstotkih.
Za pretvorbo v odstotke samo pomnoži decimalno vrednost s 100. Postopek je vedno enak: najprej preveri podatke, seštej maso topljenca in topila za maso raztopine, nato vstavi v formulo.
Prvi primer: V 180 g vode raztopimo 20 g sladkorja. Masa raztopine = 20 g + 180 g = 200 g. Masni delež = 20 g / 200 g = 0,1 = 10%. Preprosto, ne?
Drugi primer: Za 500 g raztopine s 5% NaCl potrebuješ 25 g soli. Formula: m(NaCl) = 0,05 × 500 g = 25 g.
💡 Pozor: Odstotke vedno pretvori v decimalno število za računanje (5% = 0,05)!
Praktični primeri in reševanje nalog
Tretji primer te nauči računati maso topila. Imaš 200 g 15% raztopine kisa - koliko je vode? Masa kisa = 0,15 × 200 g = 30 g, torej masa vode = 200 g - 30 g = 170 g.
Postopek reševanja je vedno sistematičen: izpiši podatke, določi kaj iščeš, izberi pravo formulo in izračunaj. Ne pozabi preveriti, ali so enote skladne!
Če rabiš maso topljenca, uporabi m(topljenec) = w × m(raztopina). Za maso topila pa odštej maso topljenca od mase raztopine. Ti izračuni postanejo avtomatski z vajo.
Najpogostejša napaka je, da v formulo vstaviš maso topila namesto mase raztopine. Zapomni si: vedno potrebuješ maso CELOTNE raztopine v imenovalcu!
💡 Trik za spomin: Raztopina je kot torta - topljenec so rozine, topilo pa testo, skupaj pa celotna torta.
Ključni nasveti za uspešno reševanje
Sistematičnost je tvoj najboljši prijatelj pri teh nalogah. Vedno začni z izpisovanjem podatkov in določitvijo, kaj iščeš. Pri računanju z odstotki pazi, da jih pretvorišь v decimalne vrednosti (15% = 0,15).
Preveri enote - če so podatki v različnih enotah, jih najprej uskladi. Masa raztopine je VEDNO vsota mase topljenca in topila - to je temelj vseh izračunov.
Hiter povzetek formul:
- w = m(topljenec) / m(raztopina)
- m(raztopina) = m(topljenec) + m(topilo)
- w(%) = w × 100%
Z malo vaje boš te naloge reševal brez težav - gre samo za logično razmišljanje in pravilno uporabo osnovnih formul.
💡 Za test: Vedno preveri, ali tvoj rezultat v odstotkih masnega deleža ne presega 100% - to bi pomenilo napako!
We thought you’d never ask...
What is the Knowunity AI companion?
Our AI companion is specifically built for the needs of students. Based on the millions of content pieces we have on the platform we can provide truly meaningful and relevant answers to students. But its not only about answers, the companion is even more about guiding students through their daily learning challenges, with personalised study plans, quizzes or content pieces in the chat and 100% personalisation based on the students skills and developments.
Where can I download the Knowunity app?
You can download the app in the Google Play Store and in the Apple App Store.
Is Knowunity really free of charge?
That's right! Enjoy free access to study content, connect with fellow students, and get instant help – all at your fingertips.
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The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
I think it’s very much worth it and you’ll end up using it a lot once you get the hang of it and even after looking at others notes you can still ask your Artificial intelligence buddy the question and ask to simplify it if you still don’t get it!!! In the end I think it’s worth it 😊👍 ⚠️Also DID I MENTION ITS FREEE YOU DON’T HAVE TO PAY FOR ANYTHING AND STILL GET YOUR GRADES IN PERFECTLY❗️❗️⚠️
Thomas R
iOS user
Knowunity is the BEST app I’ve used in a minute. This is not an ai review or anything this is genuinely coming from a 7th grade student (I know 2011 im young) but dude this app is a 10/10 i have maintained a 3.8 gpa and have plenty of time for gaming. I love it and my mom is just happy I got good grades
Brad T
Android user
Not only did it help me find the answer but it also showed me alternative ways to solve it. I was horrible in math and science but now I have an a in both subjects. Thanks for the help🤍🤍
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
I found this app a couple years ago and it has only gotten better since then. I really love it because it can help with written questions and photo questions. Also, it can find study guides that other people have made as well as flashcard sets and practice tests. The free version is also amazing for students who might not be able to afford it. Would 100% recommend
Aubrey
iOS user
Best app if you're in Highschool or Junior high. I have been using this app for 2 school years and it's the best, it's good if you don't have anyone to help you with school work.😋🩷🎀
Marco B
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE Knowunity AI. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This app is phenomenal down to the correct info and the various topics you can study! I greatly recommend it for people who struggle with procrastination and those who need homework help. It has been perfectly accurate for world 1 history as far as I’ve seen! Geometry too!
Paul T
iOS user
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
I think it’s very much worth it and you’ll end up using it a lot once you get the hang of it and even after looking at others notes you can still ask your Artificial intelligence buddy the question and ask to simplify it if you still don’t get it!!! In the end I think it’s worth it 😊👍 ⚠️Also DID I MENTION ITS FREEE YOU DON’T HAVE TO PAY FOR ANYTHING AND STILL GET YOUR GRADES IN PERFECTLY❗️❗️⚠️
Thomas R
iOS user
Knowunity is the BEST app I’ve used in a minute. This is not an ai review or anything this is genuinely coming from a 7th grade student (I know 2011 im young) but dude this app is a 10/10 i have maintained a 3.8 gpa and have plenty of time for gaming. I love it and my mom is just happy I got good grades
Brad T
Android user
Not only did it help me find the answer but it also showed me alternative ways to solve it. I was horrible in math and science but now I have an a in both subjects. Thanks for the help🤍🤍
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
I found this app a couple years ago and it has only gotten better since then. I really love it because it can help with written questions and photo questions. Also, it can find study guides that other people have made as well as flashcard sets and practice tests. The free version is also amazing for students who might not be able to afford it. Would 100% recommend
Aubrey
iOS user
Best app if you're in Highschool or Junior high. I have been using this app for 2 school years and it's the best, it's good if you don't have anyone to help you with school work.😋🩷🎀
Marco B
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE Knowunity AI. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This app is phenomenal down to the correct info and the various topics you can study! I greatly recommend it for people who struggle with procrastination and those who need homework help. It has been perfectly accurate for world 1 history as far as I’ve seen! Geometry too!
Paul T
iOS user
Kako izračunati masni delež topljenca v raztopini
Koncentracija raztopin je osnova kemije, s katero se srečaš povsod - od zdravil do kuhanja. Masni delež ti pove, koliko topljene snovi je v raztopini, kar je ključno za razumevanje kemijskih procesov.
Osnove koncentracije in masni delež
Verjetno se sprašujaš, zakaj se sploh ukvarjati s koncentracijo? No, predstavljaj si, da pripravljaš slano vodo za cmok - preveč soli in bo nečimrno, premalo pa ne bo učinkovito.
Koncentracija nam pove, koliko topljenca je v določeni količini raztopine. Masni delež (w) je eden najpreprostejših načinov za izražanje koncentracije - pove ti, kolikšen del celotne mase raztopine predstavlja masa topljenca.
Najprej moraš razumeti tri osnovne pojme: raztopina je homogena zmes (npr. sladka voda), topilo je snov v presežku (navadno voda), topljenec pa se v topilu raztaplja (sol, sladkor). Ključno pravilo, ki ga ne smeš pozabiti: masa raztopine je VEDNO vsota mase topljenca in topila!
💡 Nasvet: Masni delež je kot delež čokolade v piškotu - pove ti, koliko celotne teže piškota predstavlja čokolada.
Sign up to see the contentIt's free!
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Improve your grades
Join milions of students
Formula in izračunavanje masnega deleža
Osnovna formula za masni delež je preprosta: w(topljenec) = m(topljenec)/m(raztopina). Masni delež je decimalno število med 0 in 1, vendar ga običajno izražamo v odstotkih.
Za pretvorbo v odstotke samo pomnoži decimalno vrednost s 100. Postopek je vedno enak: najprej preveri podatke, seštej maso topljenca in topila za maso raztopine, nato vstavi v formulo.
Prvi primer: V 180 g vode raztopimo 20 g sladkorja. Masa raztopine = 20 g + 180 g = 200 g. Masni delež = 20 g / 200 g = 0,1 = 10%. Preprosto, ne?
Drugi primer: Za 500 g raztopine s 5% NaCl potrebuješ 25 g soli. Formula: m(NaCl) = 0,05 × 500 g = 25 g.
💡 Pozor: Odstotke vedno pretvori v decimalno število za računanje (5% = 0,05)!
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
Praktični primeri in reševanje nalog
Tretji primer te nauči računati maso topila. Imaš 200 g 15% raztopine kisa - koliko je vode? Masa kisa = 0,15 × 200 g = 30 g, torej masa vode = 200 g - 30 g = 170 g.
Postopek reševanja je vedno sistematičen: izpiši podatke, določi kaj iščeš, izberi pravo formulo in izračunaj. Ne pozabi preveriti, ali so enote skladne!
Če rabiš maso topljenca, uporabi m(topljenec) = w × m(raztopina). Za maso topila pa odštej maso topljenca od mase raztopine. Ti izračuni postanejo avtomatski z vajo.
Najpogostejša napaka je, da v formulo vstaviš maso topila namesto mase raztopine. Zapomni si: vedno potrebuješ maso CELOTNE raztopine v imenovalcu!
💡 Trik za spomin: Raztopina je kot torta - topljenec so rozine, topilo pa testo, skupaj pa celotna torta.
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
Ključni nasveti za uspešno reševanje
Sistematičnost je tvoj najboljši prijatelj pri teh nalogah. Vedno začni z izpisovanjem podatkov in določitvijo, kaj iščeš. Pri računanju z odstotki pazi, da jih pretvorišь v decimalne vrednosti (15% = 0,15).
Preveri enote - če so podatki v različnih enotah, jih najprej uskladi. Masa raztopine je VEDNO vsota mase topljenca in topila - to je temelj vseh izračunov.
Hiter povzetek formul:
- w = m(topljenec) / m(raztopina)
- m(raztopina) = m(topljenec) + m(topilo)
- w(%) = w × 100%
Z malo vaje boš te naloge reševal brez težav - gre samo za logično razmišljanje in pravilno uporabo osnovnih formul.
💡 Za test: Vedno preveri, ali tvoj rezultat v odstotkih masnega deleža ne presega 100% - to bi pomenilo napako!
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
We thought you’d never ask...
What is the Knowunity AI companion?
Our AI companion is specifically built for the needs of students. Based on the millions of content pieces we have on the platform we can provide truly meaningful and relevant answers to students. But its not only about answers, the companion is even more about guiding students through their daily learning challenges, with personalised study plans, quizzes or content pieces in the chat and 100% personalisation based on the students skills and developments.
Where can I download the Knowunity app?
You can download the app in the Google Play Store and in the Apple App Store.
Is Knowunity really free of charge?
That's right! Enjoy free access to study content, connect with fellow students, and get instant help – all at your fingertips.
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4.6/5
App Store
4.7/5
Google Play
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
I think it’s very much worth it and you’ll end up using it a lot once you get the hang of it and even after looking at others notes you can still ask your Artificial intelligence buddy the question and ask to simplify it if you still don’t get it!!! In the end I think it’s worth it 😊👍 ⚠️Also DID I MENTION ITS FREEE YOU DON’T HAVE TO PAY FOR ANYTHING AND STILL GET YOUR GRADES IN PERFECTLY❗️❗️⚠️
Thomas R
iOS user
Knowunity is the BEST app I’ve used in a minute. This is not an ai review or anything this is genuinely coming from a 7th grade student (I know 2011 im young) but dude this app is a 10/10 i have maintained a 3.8 gpa and have plenty of time for gaming. I love it and my mom is just happy I got good grades
Brad T
Android user
Not only did it help me find the answer but it also showed me alternative ways to solve it. I was horrible in math and science but now I have an a in both subjects. Thanks for the help🤍🤍
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
I found this app a couple years ago and it has only gotten better since then. I really love it because it can help with written questions and photo questions. Also, it can find study guides that other people have made as well as flashcard sets and practice tests. The free version is also amazing for students who might not be able to afford it. Would 100% recommend
Aubrey
iOS user
Best app if you're in Highschool or Junior high. I have been using this app for 2 school years and it's the best, it's good if you don't have anyone to help you with school work.😋🩷🎀
Marco B
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE Knowunity AI. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This app is phenomenal down to the correct info and the various topics you can study! I greatly recommend it for people who struggle with procrastination and those who need homework help. It has been perfectly accurate for world 1 history as far as I’ve seen! Geometry too!
Paul T
iOS user
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
I think it’s very much worth it and you’ll end up using it a lot once you get the hang of it and even after looking at others notes you can still ask your Artificial intelligence buddy the question and ask to simplify it if you still don’t get it!!! In the end I think it’s worth it 😊👍 ⚠️Also DID I MENTION ITS FREEE YOU DON’T HAVE TO PAY FOR ANYTHING AND STILL GET YOUR GRADES IN PERFECTLY❗️❗️⚠️
Thomas R
iOS user
Knowunity is the BEST app I’ve used in a minute. This is not an ai review or anything this is genuinely coming from a 7th grade student (I know 2011 im young) but dude this app is a 10/10 i have maintained a 3.8 gpa and have plenty of time for gaming. I love it and my mom is just happy I got good grades
Brad T
Android user
Not only did it help me find the answer but it also showed me alternative ways to solve it. I was horrible in math and science but now I have an a in both subjects. Thanks for the help🤍🤍
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
I found this app a couple years ago and it has only gotten better since then. I really love it because it can help with written questions and photo questions. Also, it can find study guides that other people have made as well as flashcard sets and practice tests. The free version is also amazing for students who might not be able to afford it. Would 100% recommend
Aubrey
iOS user
Best app if you're in Highschool or Junior high. I have been using this app for 2 school years and it's the best, it's good if you don't have anyone to help you with school work.😋🩷🎀
Marco B
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE Knowunity AI. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This app is phenomenal down to the correct info and the various topics you can study! I greatly recommend it for people who struggle with procrastination and those who need homework help. It has been perfectly accurate for world 1 history as far as I’ve seen! Geometry too!
Paul T
iOS user