Separating liquids
I can describe how a mixture of two liquids can be separated from each other.
Separating liquids
I can describe how a mixture of two liquids can be separated from each other.
Lesson details
Key learning points
- Immiscible liquids do not mix and if allowed to settle, one will float above the other.
- Immiscible liquids can be separated by decanting or using a separating funnel.
- If left, miscible liquids do not separate into layers.
- The boiling points of liquids can be used to separate miscible liquids by changing states.
Keywords
Density - Density is a measurement of mass per unit volume; how tightly packed a substance's particles are in a particular space.
Boiling point - The boiling point of a substance is the temperature at which it changes from a liquid state to a gas state.
Immiscible - Liquids that are not soluble in another liquid are described as immiscible in that liquid.
Miscible - Liquids that dissolve in another liquid are described as miscible in that liquid.
Decanting - Decanting is a process of pouring off the top layer in a mixture of immiscible liquids, or a liquid and insoluble solid.
Common misconception
If a substance cannot be seen, it has disappeared and is no longer present.
Remind pupils of work regarding evaporation and use particle models to describe / explain what a solution of two liquids is like.
Equipment
Licence
Lesson video
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Prior knowledge starter quiz
6 Questions
Q1.True or false? Solids that do not dissolve in a liquid are called insoluble.
Q2.What is the process of changing a liquid into a vapour (gas) called?
Q3.True or false? When a solution is heated, the solvent evaporates more slowly.
Q4.Which properties below would be helpful in separating a mixture of substances?
Q5.True or false? All liquids have the same boiling point of 100℃.
Q6.In a mixture of two liquids with very different densities, the less dense liquid will ...
Assessment exit quiz
6 Questions
Q1.What is the main purpose of using a 'separating funnel' in the lab?
Q2.True or false? Decanting is effective for separating liquids with similar densities.
Q3.If two liquids can mix completely together to form one layer, they are said to be ...
Q4.True or false? A separating funnel can be used to separate two liquids that are miscible.
Q5.Match the keywords with their correct definition.
Measurement of mass per unit volume.
Liquids that are not soluble in another liquid.
Liquids that dissolve in another liquid.
Process of pouring off the top layer in a mixture of liquids
A mixture comprised of a solute dissolved in a solvent.