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Dry ammonia has no action on litmus paper but a solution of ammonia in water turns red litmus paper blue. Why is it so? |
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Answer» In dry state Ammonia contains no hydroxyl ions. On dissolving in water, it forms NH4OH which dissociates to give NH4 + and OH-ions. Thus solution becomes basic and turns red litmus paper blue. NH3 (g) + H2O (l) ---------------> NH4OH (aq) NH4OH (aq) --------------> NH4+ (aq) + OH- (aq) |
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