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When a substance can be Amphiprotic explain with examples?
When it can act as a Bronsted acid (donates a proton) or a Bronsted base (accepts a proton)
amphiprotic substances are ions or molecules that can behave as a Bronsted acid or base. i.e. water
water is acting as an acid as it donates a proton to ammonia ##H_2O_"(l)" + NH_(3 "(aq)") rarr OH^(-)._"(aq)" + NH_4^+._("(aq)")##
Water is acting as a base when it accepts a proton from hydrochloric acid. ##H_2O + HCl rarr H_3O^+ + Cl^-##
Another example of an amphiprotic substance is dihydrogen phosphate, ##H_2PO_4^-##