Loading please wait

The smart way to improve grades

Comprehensive & curriculum aligned

Try an activity or get started for free

What Affects Solubility?

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

'What Affects Solubility?' worksheet

Key stage:  KS 3

Curriculum topic:   Chemistry: Pure and Impure Substances

Curriculum subtopic:   Mixtures, including Dissolving

Difficulty level:  

Worksheet Overview

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:

 

Solution diagram

 

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.

 

Want a bit more help with this before you begin? Why not watch this short video?

 

What is EdPlace?

We're your National Curriculum aligned online education content provider helping each child succeed in English, maths and science from year 1 to GCSE. With an EdPlace account you’ll be able to track and measure progress, helping each child achieve their best. We build confidence and attainment by personalising each child’s learning at a level that suits them.

Get started
laptop

Try an activity or get started for free

  • educational
  • bettfutures
  • cxa
  • pta
  • era2016
  • BDA award
  • Explore LearningTuition Partner
  • tacm