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What do you understand by the term 'auto-prolysis' of water ? What is its significance ? |
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Answer» Solution :Auto-protolysis means self ionization of WATER. It may be represented as `underset("ACID"_(1))(H_(2)O(l))+ underset("Base"_(2))(H_(2)O(l))hArr underset("Acid"_(2))(H_(2)O^(+)(aq))+underset("Base"_(1))(OH^(-)(aq))` DUE to auto-protolysis , water is amphoteric in nature, i.e., it reacts with both acids and bases. It ACTS as a base towards acids STRONGER than itself and as an acid towards bases stronger than itself. For example, `underset("Acid"_(1))(H_(2)O(l))+ underset("Base"_(2))(NH_(3)(aq))hArr underset("Acid"_(2))(NH_(4)^(+)(aq))+underset("Base"_(1))(OH^(-)(aq))` `underset("Acid"_(1))(H_(2)O(l))+ underset("Base"_(2))(H_(2)S(aq))hArr underset("Acid"_(2))(H_(3)O^(+)(aq))+underset("Base"_(1))(HS^(-)(aq))` |
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