Which one of the following statements is not true?

Question

pH + pOH = 14 for all aqueous solutions

The pH of 1 $\times$ 10^-8 M HCl is 8

96,500 coulombs of electricity when passed through a CuSO₄ solution deposits 1 gram equivalent of copper at the cathode

The conjugate base of $H_2PO_4^-$ is $HPO_4^{2-}$

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