Learning Outcomes

I can identify the solute and the solvent in a solution and describe what these terms mean

Making a Copper Sulphate Solution

Collect a beaker and a jar of copper sulphate powder. Add a spatula of copper sulphate to the water. Stir until the copper sulphate dissolves. Keep adding until no more copper sulphate dissolves

The copper sulphate is the substance which dissolves and is called the solute.

The water is dissolving the solute and is called the solvent.

When no more copper sulphate dissolves a saturated solution is formed.

Use the information from the previous slide and read pages

26 and 27 in Science 5-14, S1.

Write down the definitions for each of

the following terms in your

jotter.

Solute

Soluble

Insoluble

Solvent

Saturated solution

Solution

Your teacher may demonstrate a fun experiment which uses a supersaturated solution. This is a saturated solution which has been heated to dissolve the solid. It is very unstable.

Vanishing Varnish (1)Vanishing Varnish (1)

Water is not the only solvent. Other liquids can also dissolve

substances. Collect a slide with 5 streaks of nail varnish and 5 bottles of solvents

(water, propanone, ethanol, white spirit and propan-2-ol) Soak a cotton bud with a solvent and rub one of the streaks of nail

varnish. Count how many rubs are needed to remove the streak. Repeat with the other solvents.

Copy the table on the next slide for your results.

Vanishing Varnish (2)

Answer the following questions in your jotter.Q1. Which solvent(s) did not dissolve the varnish?Q2. Which solvent(s) did dissolve the varnish?Q3. Which solvent was the best at dissolving the varnish? Give a reason for your

answer.

Solvent Did Solvent Dissolve the Varnish?

Number of rubs to remove Varnish

water

propanone

ethanol

white spirit

propan-2-ol

Summary

A __________ is the substance which dissolves.

A __________ is the liquid which does the dissolving.

A __________ substance will dissolve.

An __________ substance will not dissolve.

A ___________ solution can hold no more solute.

Wordbank

insoluble saturated soluble solute solvent

Summary

A solute is the substance which dissolves. A solvent is the liquid which does the

dissolving. A soluble substance will dissolve. An insoluble substance will not dissolve. A saturated solution can hold no more

solute.