Question

An aqueous solution of CuSO4 is subjected to electrolysis using inert electrodes. The pH of the solution will

• A. decrease
• B. increase or decrease depending on the strength of the current.
• C. increase
• D. remains unchanged

Answer 1

Answer: (A)

decrease

Answer 2

$At \,cathode : \quad Cu_{\left(aq\right)}^{2+}+2e^{-} \to Cu_{\left(s\right)}$
$At \,anode :\quad2H_{2}O \to O_{2} +4H^{+}+4e^{-}$
Production of $H^{+}$ ions will decrease pH.