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What is the best substances for drying a...

What is the best substances for drying ammonia and why?

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Ammonia can be best dried by passing over quick lime, CaO, since, there is no reaction between them. However, conc. `H_2SO_4, P_2O_5` of anhydrous `CaCl_2` can.t be used for the purpose because `NH_3` reacts with them as follows:
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