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# Chemistry - Solution, Solute and Solvent

Problem Set

Hi everyone! There were many discussion/notes that wanted Brilliant.org to include Chemistry but it failed as it is a very difficult task. However, now we can share notes and problems freely that may make chemistry problems come true. So I hope Brilliant users that are advanced in Chemistry will share some notes and the related problems and I believe someday, Chemistry will also be a major topic!

I will start from a topic of chemistry which is much related to mathematics application.

Solute - The substance that dissolves to form a solution

Solvent - The substance in which a solute dissolves

Solution - A mixture of one or more solutes dissolved in a solvent

**Solutions are homogenous systems, which means the solute is evenly spread out and mixed together in the solvent.

Solubility

Definition: At a fixed temperature, the maximum mass of a solute that can dissolve in the fixed mass of solvent(usually 100g).

If at $$50^\circ C$$, $$60g$$ is the maximum mass of $$NH_{4}Cl$$ can dissolve in $$100g$$ of water, the solubility is:

$$60g/100g$$ water.

Some other notes:

1. The solubility of a solute varies in different temperature.

2. At a fixed pressure, the solubility of a liquid or solid solute increase as the temperature increase but the solubility of a gas solute decrease instead.

3. At a fixed temperature, the solubility of gas solute increase as the pressure increase.

4. Solubility of a liquid or solid solute is not much affected by the pressure.

Now there is an example:

Let a $$50g$$, $$20^\circ C$$ $$KNO_3$$ saturated solution evaporate and we can get $$12g$$ crystallized $$KNO_3$$. Calculate the solubility of $$KNO_3$$ when it is at $$20^\circ C$$.

Solution:

Mass of solute($$KNO_3$$) $$=12g$$

Mass of solvent(water) $$=50g-12g=38g$$

At $$20^\circ C$$,

$$38g$$ water dissolves $$12g KNO_3$$ (Note that this means the solvent dissolves the maximum mass of solute already as it is a saturated solution. If now we add 2g of the solute, it will not dissolve into the solvent.)

Then,

$$100g$$ water dissolves $$x g KNO_3$$

So, $$x=31.6g/100g$$ water.

I only summarise the idea of this topic and the example is very easy. I apologize if I cannot make a clear explanation for you. However, follow me as I will share more tougher chemistry problems for you!

Note by Christopher Boo
2 years, 9 months ago

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Christopher -

This is a nice post! I'm looking forward to more Chemistry from you, and the rest of the community. Chemistry was actually my worst science subject when I was in school, and I never really "got it." I'd be very happy to pick a few things up and maybe have a clue what makes it so interesting to so many people. :) · 2 years, 9 months ago

Same here, Chemistry has been my worst too.I will try to solve most of chemistry problems.

Actually, I feel myself comfortable with mathematical(physical) chemistry, but not with organic, or inorganic.Brilliant should introduce ways to draw structures of various compounds,because most of organic or inorganic chemistry problems are related to structures, or use structures somewhere. · 2 years, 9 months ago

Hi Jatin -

Right now, Brilliant makes it easy to attach a picture from your computer or phone to any problem. Our hope is that that utility helps people with their need for drawn figures. · 2 years, 9 months ago

Same as Jatin, I enjoy physical chemistry but not organic and inorganic. I have no idea why others like organic chemistry too because for me, I study those by memorizing. So I think it is quite boring. However, I hope other people who are interested in organic and inorganic chemistry can share their thoughts with me! · 2 years, 9 months ago

Hey Everybody!

Christopher also wrote us nice problems to accompany his post:

Solution, Solute and Solvent Problem 1

Solution, Solute and Solvent Problem 2 Staff · 2 years, 9 months ago

Solution, Solute and Solvent Problem 3

Solution, Solute and Solvent Problem 4

Solution, Solute and Solvent Problem 5

Solution, Solute and Solvent Problem 6

Solution, Solute and Solvent Problem 7

Among the problems, Problem 6 and Problem 7 are harder. I know I did not use cool names but as this is only some warm up problems, I think it's ok? · 2 years, 9 months ago

Excellent! I have edited your note, so that people in the future can efficiently access your problems, and the concepts that apply to them from the top of this note. Staff · 2 years, 9 months ago

Thank you very much! · 2 years, 9 months ago

Nice introductory post! Keep it up! · 2 years, 9 months ago

Nice post! · 2 years, 9 months ago

Electrochemistry Post 1 - Electrochemistry

Follow me for further posts on this topic. · 2 years, 8 months ago

create a #Chemistry tag · 2 years, 9 months ago

Thank you all of you who appreciate my notes! I am currently working on the Partition Law which I think is very interesting, hope you guys will love it. · 2 years, 9 months ago

Awesome post! I'm really looking forward to see a Chemistry section in Brilliant! I also posted a Chemistry problem a couple of weeks ago on the common-ion effect and solubility product, feel free to check it out:

So many solutions! · 2 years, 9 months ago

IT IS REALLY QUITE HELPFUL.NICE POST! · 2 years, 9 months ago

Hi Christoper - this is very good, and will also give good practice for participants of the IChOO! · 2 years, 9 months ago

Great idea! I'm willing to help/support this topic. · 2 years, 9 months ago

is there a more easier way to calculate the solubility of a substance? · 2 years, 6 months ago

nice share dude · 2 years, 6 months ago

Can you post a few more problems about this topic so I can be sure that I really understand it?

Or give me some links to websites that provides questions of this topic? · 2 years, 9 months ago

I can't find any good website provide chemistry questions. However, I will try to include more problems. I see you solved problem 7 which I think is the hardest. So I guess you want harder problems? · 2 years, 9 months ago

Great job, now I can learn chemistry easily · 2 years, 9 months ago

SO there coming is THE CHEMICAL SAGA............. Hope its chemically wonderful... · 2 years, 9 months ago

hi guys!!!i'm a newbie in this website but i believe that this site will help me to become better!!!!!!!i hope that you will help me to about solving and analyzing data/problem?????????????but now i want to thank you!!hahah@@awkward · 2 years, 9 months ago