Heat a few crystals of copper sulphatein a dry boiling tube.n What is the colour of the coppersulphate after heating?n Do you notice water droplets in theboiling tube? Where have these comefrom?n Add 2-3 drops of water on the sampleof copper sulphate obtained afterheating.n What do you observe? Is the bluecolour of copper sulphate restored?
Question
Heat a few crystals of copper sulphatein a dry boiling tube.n What is the colour of the coppersulphate after heating?n Do you notice water droplets in theboiling tube? Where have these comefrom?n Add 2-3 drops of water on the sampleof copper sulphate obtained afterheating.n What do you observe? Is the bluecolour of copper sulphate restored?
Solution
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When you heat a few crystals of copper sulphate in a dry boiling tube, the colour of the copper sulphate changes from blue to white. This is because the heat drives off the water molecules that were previously bound to the copper sulphate, causing it to lose its blue colour.
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Yes, you may notice water droplets in the boiling tube. These have come from the copper sulphate crystals. Copper sulphate is a hydrated salt, which means it contains water molecules as part of its structure. When you heat the crystals, this water is released as steam, which then condenses to form droplets in the boiling tube.
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If you add 2-3 drops of water to the sample of copper sulphate obtained after heating, you will observe that the blue colour of the copper sulphate is restored. This is because the water molecules are reabsorbed by the copper sulphate, returning it to its original hydrated state.
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