Separation of Mixtures: Choose the Right Method
Understand that every separation technique exploits one physical difference between the components, such as size, magnetism, solubility, boiling point or density, and that the right choice depends on the mixture.
Before you try
What if you tried to filter salty water? Would the salt stay in the paper?
Try it out
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What happened?
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Each method separates perfectly here. Real separations leave traces behind and usually need repeating.
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Try these ideas
- Separate sand, salt and water using three methods in the right order.
- Try filtration on salt water and read why it does nothing.
- Compare evaporation and distillation on the same mixture.
Why it works
A mixture is two or more substances jumbled together but not chemically joined, which is why physical methods can separate them. Each method uses one difference. A magnet picks out iron because iron is magnetic. Filtration catches solid pieces too big to pass through the paper, but dissolved salt slips straight through with the water. Evaporation drives the liquid off as vapour and leaves the dissolved solid behind, while distillation cools that vapour back and keeps both parts.
In this simulator you choose a mixture and apply methods one at a time. Anything that fits is separated into a side container with the property it used named for you; anything that does not fit explains why nothing happened. A steps list records your route and the panel compares it with the fewest steps possible for that mixture.
Check your understanding
Question 1 of 4
Why does filtration fail to remove salt from salt water?
You want to keep both the water and the dissolved salt. Which method?
Which difference does a separating funnel use?
Which method separates the different dyes in an ink?
Explain it in your own words
What changed? Why did it happen? Where might you notice this in everyday life?
What will you discover next?
Try Solutions and Solubility: How Much Will Dissolve? next.
For parents & teachers
- Separate a real mixture of sand and salt at home and talk through each step.
- Ask how a water treatment plant removes mud from river water.
- Try paper chromatography with a felt pen and a strip of kitchen towel.