Making a pure dry sample of a soluble salt
I can carry out a multistage chemical procedure to make a pure dry sample of a soluble salt.
Making a pure dry sample of a soluble salt
I can carry out a multistage chemical procedure to make a pure dry sample of a soluble salt.
These resources will be removed by end of Summer Term 2025.
Lesson details
Key learning points
- Reacting a metal oxide with an appropriate acid can form a desired salt and water.
- Adding metal oxide to excess ensures that the acid fully reacts to form salt and water.
- Excess metal oxide can be removed by filtration so that the filtrate contains only salt and water.
- Water can be removed from the salt by evaporation.
Keywords
Soluble - When a substance dissolves in a liquid, it is described as soluble in that liquid.
Excess reactant - any reactant present in a greater amount than is necessary to completely react with the limiting reactant
Filtration - a technique to separate insoluble solids from a liquid by passing the mixture it is in through a filter
Crystallisation - a process that forms solid crystals from a saturated solution by evaporating the solvent
Common misconception
Pupils often do not understand that observing excess metal oxide in the reaction mixture means that the acid has fully reacted.
Emphasise how to observe the end of the reaction and what these observations mean, i.e. excess metal oxide in the reaction mixture or using pH paper to indicate the solution is neutral. Both are evidence of the acid having fully reacted.
Equipment
dilute sulfuric acid, copper oxide, measuring cylinder, Bunsen burner, tripod and gauze, spatula, beakers, universal indicator paper, filter paper and funnel, conical flask and evaporating dish
Licence
This content is © Oak National Academy Limited (2024), licensed on Open Government Licence version 3.0 except where otherwise stated. See Oak's terms & conditions (Collection 2).
Lesson video
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Starter quiz
6 Questions
magnesium and hydrochloric acid
copper oxide and sulfuric acid
copper oxide and nitric acid
Exit quiz
6 Questions
the property of a substance that dissolves in a liquid
the reactant left over after a reaction is complete
a technique for separating insoluble solids from a liquid
forming solid crystals from a saturated solution by evaporation
the reactant that is fully used up during a reaction