Separating soluble solids from solutions
Lesson details
Learning outcome
I can describe how to separate a soluble solid from a solution.
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.
Teacher tip
Encourage children to use the correct vocabulary (dissolve, soluble and solution). For safety, children should not use taste to test for the presence of substances in a science lesson.
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.
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?
To help you plan your 5 science lesson on: Separating soluble solids from solutions, download all teaching resources for free and adapt to suit your pupils' needs...
To help you plan your 5 science lesson on: Separating soluble solids from solutions, download all teaching resources for free and adapt to suit your pupils' needs.
The starter quiz will activate and check your pupils' prior knowledge, with versions available both with and without answers in PDF format.
We use learning cycles to break down learning into key concepts or ideas linked to the learning outcome. Each learning cycle features explanations with checks for understanding and practice tasks with feedback. All of this is found in our slide decks, ready for you to download and edit. The practice tasks are also available as printable worksheets and some lessons have additional materials with extra material you might need for teaching the lesson.
The assessment exit quiz will test your pupils' understanding of the key learning points.
Our video is a tool for planning, showing how other teachers might teach the lesson, offering helpful tips, modelled explanations and inspiration for your own delivery in the classroom. Plus, you can set it as homework or revision for pupils and keep their learning on track by sharing an online pupil version of this lesson.
Explore more key stage 2 science lessons from the Properties, changes and separating materials unit, dive into the full primary science curriculum, or learn more about lesson planning.