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Explain What Factors Affect Solubility

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

'Explain What Factors Affect Solubility' worksheet

Key stage:  KS 3

Year:  Year 9 Science worksheets

Curriculum topic:   Chemistry: Pure and Impure Substances

Curriculum subtopic:   Mixtures, including Dissolving

Difficulty level:  

Worksheet Overview

A mixture contains different substances that are not chemically joined to each other.


A solution is a type of mixture formed when a soluble solute dissolves in a solvent. 


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 (the solute) dissolves, the particles come away from each other as they mix with the particles in the liquid (the solvent). 


Solution diagram


What can affect the speed at which a solute dissolves in a solvent? 

Heating - In general, solids become more soluble as temperature increases. Warming the solvent helps the solute to dissolve, forming a solution quicker. This is because when the solvent is heated, all of the particles gain energy which causes them to vibrate and move faster. The faster the solute and solvent particles move, the better their chances of interacting with more particles, thus increasing the rate at which they are able to form a solution.


Heating has the opposite effect on the solubility of gases. If you heat up a gas, the gas will expand and escape from its solvent, decreasing its solubility.


Are you happy with all that?


girl on tablet


Let's try some questions on temperature and solubility.

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