Write chemical reactions to show amphoteric nature of water.

Solution

The following reactions of water show its amphoteric nature i.e. water behaves both as an acid as well as the base.
(i) Water acting as an acid.

stack straight H subscript 2 straight O left parenthesis straight l right parenthesis with Acid below space plus space stack NH subscript 3 with Base below space space space rightwards arrow space space space NH subscript 4 superscript plus left parenthesis aq right parenthesis space plus space OH to the power of minus left parenthesis aq right parenthesis

stack straight H subscript 2 straight O left parenthesis straight l right parenthesis with Acid below space plus space stack CO subscript 3 superscript 2 minus end superscript left parenthesis aq right parenthesis with Base below space space rightwards arrow space space space HCO subscript 3 superscript minus left parenthesis aq right parenthesis space plus space OH to the power of minus left parenthesis aq right parenthesis

(ii) Water acting as a base.

stack straight H subscript 2 straight O left parenthesis straight l right parenthesis with Base below space plus space stack HCl left parenthesis aq right parenthesis with Acid below space space rightwards arrow space space space straight H subscript 3 straight O to the power of plus left parenthesis aq right parenthesis space plus space Cl to the power of minus left parenthesis aq right parenthesis stack straight H subscript 2 straight O left parenthesis straight l right parenthesis with Base below space plus space stack CH subscript 3 COOH left parenthesis aq right parenthesis with Acid below space space rightwards arrow space space space straight H subscript 3 straight O to the power of plus left parenthesis aq right parenthesis space plus space CH subscript 3 COO to the power of minus left parenthesis aq right parenthesis

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