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Filtering Sandy Water
Age 11 · Science
When sand is mixed with water, it does not dissolve, so the water looks cloudy. Pouring it through filter paper traps the sand and lets clear water drip through.
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Age 11: open this week
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In the picture
- The mixture: sand stirred into water, which stays cloudy because sand does not dissolve
- The residue: wet sand trapped in the filter paper
- The filtrate: clear water that passed through the paper
Examples
- A coffee filter keeps the ground coffee and lets the coffee drink through
- A pasta strainer keeps the pasta and lets the cooking water drain away
Key takeaways
- Filtration separates an insoluble solid from a liquid
- The solid left in the filter is the residue; the liquid that passes through is the filtrate
Quiz: Filtering Sandy Water (Age 11)
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Why does water with sand stirred into it look cloudy?
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In filtration, what is the clear liquid that passes through the filter paper called?
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What can filtration separate?
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