Question

Write two equations to show the amphiprotic (acid as well as base) property of water.

Answer 1

Amphoteric substance is that substance which has ability to donate as well as accept a Proton.

According to Bronsted -Lowry concept,bases stronger than water,tend to accept proton from it.Thus by donating proton,water acts as an acid.

H₂O + NH₃ <==> OH- + NH₄+

While acid stronger than water,like HCl ,tend to donate proton to water.Thus by accepting proton from such strong acids,water acts as base.

H₂O + HCl <===> H₃O+ + Cl-

Thus water can donate as well as accept proton and show amphoteric nature.

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Answer 2

Al2o3 + HCl - Alcl3 + H2O

Zno + HCl - zncl2 + H2o