The reaction
`HCN +H_(2)O hArr H_(3)O^(+)+CN^(-),` the conjugate acid base pair is

In the reaction NH_(3) + H_(2)O hArr NH_(4)^(+) + barOH , the conjugate acid-base pair is

In the reaction HNO_(3)+H_(2)O hArr H_(2)O ^(+) +NO_(3)^(-) the conjugate base of HNO_(3) is

H_2CO_3 ionises in two stages as represented below H_2CO_3 +H_2O hArr H_3O^(+) +HCO_3^(-) , HCO_3^(-) +H_2O hArr H_3O^(+) CO_3^(2-) the no. of conjugate acid -base pairs in the above reaction are

The ionisation of hydrochloric in water is given below: HCI(aq)+H_(2)O(l)hArrH_(3)O^(+)CI^(-)(aq) Label two conjugate acid- base pairs in this ionisation.

Write the conjugate acid and base for H_(2)O