Separating soluble solids from solutions
I can describe how to separate a soluble solid from a solution.
Separating soluble solids from solutions
I can describe how to separate a soluble solid from a solution.
Lesson details
Key learning points
- A solid that dissolves in a liquid is called soluble. This makes a solution.
- Soluble solids can not be recovered using filtering.
- Soluble solids can be recovered from a liquid using evaporation.
- Evaporation is when a liquid changes to invisible water vapour (gas) in the air.
Keywords
Dissolve - If a solid or gas dissolves in a liquid, it mixes so completely with the liquid that it cannot be seen.
Soluble - Solids and gases that dissolve in a liquid are soluble.
Solution - A solution is a mixture of a liquid with a dissolved solid or gas.
Separate - To separate something, you put different parts of it into different groups.
Evaporate - To evaporate is to change from a liquid to a gas.
Common misconception
A dissolved solid ceases to be present in the solution it forms – it turns into water. When you pass salt water through a filter paper, the salt is removed.
Children carry out practical activities to discover which methods can and cannot be used to recover salt from a solution.
Equipment
See additional materials: beakers, spoons, filter papers, funnels, salt, sugar or other soluble solids, water, equipment to carry out evaporation.
Content guidance
- Risk assessment required - equipment
Supervision
Adult supervision required
Licence
Lesson video
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Prior knowledge starter quiz
6 Questions
Q1.What method is often used to separate an insoluble solid from a liquid?
Q2.At a temperature below 0°C, water is in a _________ state.
Q3.Melting happens when you ...
Q4.What is the name of the process when a liquid turns into a solid?
Q5.What is the name of the process when a gas turns into a liquid?
Q6.Which of these materials is soluble in water?
Assessment exit quiz
6 Questions
Q1.A solid that dissolves in a liquid is .
Q2.A solid dissolved in a liquid forms a __________.
Q3.Which of these methods cannot be used to recover soluble solids from a solution?
Q4.Match the type of solid to the method which can be used to recover it from a liquid.
evaporating
filtering
sieving
Q5.Water is evaporating from the clothes on the washing line. Evaporation is when …
Q6.When the liquid part of a solution evaporates, what is left behind?
