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Question
Give reasons for the following:
In the laboratory preparation of nitric acid, the mixture of concentrated sulphuric acid and sodium nitrate should not be heated very strongly, above 200°C.
In the laboratory preparation of nitric acid, the mixture of concentrated sulphuric acid and sodium nitrate should not be heated very strongly, above 200°C.
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Solution
The mixture of concentrated sulphuric acid and sodium nitrate must not be heated above 200oC because of the following reasons:
- Nitric acid will decompose into nitric oxide gas.
- Potassium or sodium sulphate will be formed, which may stick to the glass walls and cannot be removed easily.
- Glass apparatus may also break.
- Nitric acid will decompose into nitric oxide gas.
- Potassium or sodium sulphate will be formed, which may stick to the glass walls and cannot be removed easily.
- Glass apparatus may also break.
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