Aqueous solution of AgNO₃ is electrolysed using inert electrodes. At the end of electrolysis

Electrolysis reaction:

${\mathrm{AgNO}}_3\to {\mathrm{Ag}}^{+}+{\mathrm{NO}}_3^{-}$

Cathode reaction: 

SRP of Ag⁺ > SRP of SHE, Ag⁺ undergoes reduction

${\mathrm{Ag}}_{\left(\mathrm{aq}\right)}^{+}+{\mathrm{e}}^{-}\to {\mathrm{Ag}}_{\left(\mathrm{s}\right)}$

Anode reaction:

SOP of H₂O > SOP of ${\mathrm{NO}}_3^{-}$, water undergoes oxidation

$2{\mathrm{H}}_2\mathrm{O}-4{\mathrm{e}}^{-}\to {\mathrm{O}}_2+4{\mathrm{H}}^{+}$

after electrolysis cell is left with HNO₃ a strong acid ,pH of the solution decreases