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Sugar in water
Age 11 · Chemistry
When sugar dissolves in water, it seems to vanish, but all of its mass is still there. If you add too much, some stays at the bottom, and if the water evaporates, the sugar crystals come back.
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Age 11: open this week
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In the picture
- Sugar and water together: the total mass stays the same after dissolving
- A saturated solution: extra sugar can no longer dissolve and stays at the bottom
- Crystals left after evaporation: the dissolved sugar is recovered
Examples
- Stirring sugar into tea until it disappears
- Salt left behind on a dry beach rock after seawater evaporates
Key takeaways
- Dissolving does not make matter disappear: the mass is conserved.
- Water can only dissolve so much solid before it is saturated.
Quiz: Sugar in water (Age 11)
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After sugar dissolves in water, how does the mass of the sugar water compare with the mass of the sugar and water before mixing?
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You keep adding sugar to a glass of water and stirring. At some point sugar stays at the bottom. What does this mean?
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You leave a dish of sugar water until all the water has evaporated. What is left in the dish?
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