# What Affects Solubility?

In this worksheet, students will find out what determines the solubility of a substance.

Key stage:  KS 3

Curriculum topic:   Chemistry: Pure and Impure Substances

Curriculum subtopic:   Mixtures, including Dissolving

Difficulty level:

### QUESTION 1 of 10

When we talk about solubility, we usually think of water as a solvent. However, water is not the only solvent and not everything dissolves in water. For example, nail varnish does not dissolve in water, but it does in a liquid called propanone. As you may have guessed, propanone is used in nail polish removers!  Other examples include gloss paint, which cannot dissolve in water, but in a solvent called white spirit. You can't wash off gloss paint, but you can remove it with white spirit.

We can explain what happens when something dissolves using ideas about particles. The particles in a solid are all held together in a fixed arrangement. When the solid dissolves, the particles come away from each other as they mix with the particles in the solvent. The diagram shows how the particles behave while dissolving:

Would you think a whole bag of sugar can dissolve in a glass of water? The answer is no! Even soluble substances like sugar cannot keep dissolving forever. A big bag of sugar is too much to be dissolved in a glass of water. You can find out how much sugar will dissolve if you add a little at a time. When no more sugar can dissolve, there will be some crystals left at the bottom. The solution is now saturated. It contains as much dissolved solid as it possibly can. Every solid has a specific solubility. For example, if 10 g of a solid can dissolve in 100 ml of water, we say that the solubility of that solid is 10 g per 100 ml of water.

Finally, temperature is another factor that affects solubility: more solid can dissolve in the same amount of water when the water is hotter.

Let's find out more about solubility.

Is this statement true or false?

Nail varnish is soluble in water.

true

false

Complete this sentence.

The solvent for nail varnish is called ___________ .

Complete this sentence.

The solvent that is best for removing gloss paint is called __________ .

Describe what happens to particles of a solid when they dissolve in a solvent.

There are three correct answers.

Solid particles are held together by strong bonds in a fixed arrangement.

Solid particles are loosely held together.

When you add the solvent, solid particles break away from each other.

Particles of solid solute and liquid solvent mix.

The particles of the solid and the liquid do not mix when dissolving.

Can you keep on dissolving more and more of a solid in a liquid?

yes

no

Which of the following best describes a saturated solution?

A solution that can have more solid dissolved in it.

A solution that cannot take more solvent dissolved in it.

A solution that can have half the amount of a solvent dissolved in it.

How can you find out how much salt can dissolve in a bowl of water?

Add a whole packet of salt and stir.

Add a table spoon of salt, stir and remove the white crystals formed at the bottom.

Add salt a little at the time, until the first crystals form at the bottom of the bowl.

The maximum amount of solid A that can be dissolved in liquid B is 10 g.

What is the solubility of solid A?

10 g of A per 100 ml of B.

5 g of A per 50 ml of B.

I cannot answer this question, because I don't know the amount of liquid B.

Solid C has a solubility of 35 g per 100 ml of water. How much of solid C can dissolve in 200 ml of water?

Type how many g in the box below.

You have two mugs of tea. One is warm and the other one is iced tea. You add 1 spoonful of sugar to each mug and stir them.

Which drink will have more sugar dissolved in it?

iced tea

warm tea

• Question 1

Is this statement true or false?

Nail varnish is soluble in water.

false
EDDIE SAYS
The statement is false. Nail varnish is insoluble in water. It dissolves in another solvent called PROPANONE.
• Question 2

Complete this sentence.

The solvent for nail varnish is called ___________ .

propanone
EDDIE SAYS
Propanone is the solvent for nail varnish.
• Question 3

Complete this sentence.

The solvent that is best for removing gloss paint is called __________ .

white spirit
EDDIE SAYS
Gloss paint can be removed using white spirit.
• Question 4

Describe what happens to particles of a solid when they dissolve in a solvent.

There are three correct answers.

Solid particles are held together by strong bonds in a fixed arrangement.
When you add the solvent, solid particles break away from each other.
Particles of solid solute and liquid solvent mix.
EDDIE SAYS
The three correct statement are:
• Solid particles are held together by strong bonds in a fixed arrangement.
• When you add the solvent, solid particles break away from each other.
• Particles of solid solute and liquid solvent mix.
• Question 5

Can you keep on dissolving more and more of a solid in a liquid?

no
EDDIE SAYS
No, only a specific amount of a solid can dissolve in a specific amount of a liquid. Moreover, not all liquids are solvents for all solids.
• Question 6

Which of the following best describes a saturated solution?

A solution that cannot take more solvent dissolved in it.
EDDIE SAYS
Saturated solutions are those that cannot take more solute dissolved in them. Option 2 is correct. Option 1 states the opposite and Option 3 describes a solution that is not saturated yet.
• Question 7

How can you find out how much salt can dissolve in a bowl of water?

Add salt a little at the time, until the first crystals form at the bottom of the bowl.
EDDIE SAYS
In order to find how much salt can dissolve in a bowl of water, you have to add salt a little at the time, until the first crystals form at the bottom of the bowl. You must measure how much salt you have used.
• Question 8

The maximum amount of solid A that can be dissolved in liquid B is 10 g.

What is the solubility of solid A?

I cannot answer this question, because I don't know the amount of liquid B.
EDDIE SAYS
We cannot find the solubility of a solid if we don't know how much liquid we have dissolved it in.
• Question 9

Solid C has a solubility of 35 g per 100 ml of water. How much of solid C can dissolve in 200 ml of water?

Type how many g in the box below.

70
70g
70 g
EDDIE SAYS
200 ml is double the amount of 100 ml, so you have to double the amount of solid as well. 2 x 35 = 70 g of solid C.
• Question 10

You have two mugs of tea. One is warm and the other one is iced tea. You add 1 spoonful of sugar to each mug and stir them.

Which drink will have more sugar dissolved in it?

warm tea
EDDIE SAYS
Temperature affects solubility, so the warm tea can have more sugar dissolved in it.
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