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1. Why the concentrated solution should not be heated for a long time?
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The concentrated solution is stronger than other normal solution. If they had been heated for a long time there may be chances to increase their strongest and make them highly concentrated which can be hardest to handle. Also by heated them for long time, they can convert into a hard sticky form which can stick to wall of vessels and harder to be remove. Hence, concentrated solution shouldn't heated for a long time
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It may become hard and sticky
example
In the above picture the mixture of concentrated sulphuric acid and sodium nitrate should not exceed 200 degree Celsius because sodium sulphate formed at higher temperature forms a hard crust and stick to the retort which is hard to remove. And nitric acid may also decompose
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