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Write the chemical reactions to show the amphoteric nature of water. 

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Water is amphoteric in nature and it behaves both as an acid as well as a base. With acids stronger than itself (eg., H2S) it behaves as a base and with bases stronger than itself (eg. NH3) it acts as an acid.

(i) As a base: H2O(l) +H2S(aq) → H3O + (aq) +HS-(aq) 

(ii) As an acid: H2O(l) +NH3(aq) → OH-(aq) + NH4+ (aq)

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