(D) An amphoteric substance can act as both an acid and a base. $H_2O$ acts as an acid by donating a proton: $\mathop {H_2O}\limits_{\text{Acid}} \to

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(D) An amphoteric substance can act as both an acid and a base. $H_2O$ acts as an acid by donating a proton: $\mathop {H_2O}\limits_{\text{Acid}} \to H^{+} + OH^{-}$. $H_2O$ acts as a base by accepting a proton: $\mathop {H_2O}\limits_{\text{Base}} + H^{+} \to H_3O^{+}$. Therefore,water is an amphoteric solvent.