$p^H$ of 0.05 M Ammonium formate solution at 298 K is 6.93. $p^H$ of 0.01M Ammonium formate solution at the same temperature would be

HCOONH₄ is a salt of  WA - WB

p^H of salt of WA-WB is independent of concentration of the salt.

p^H of salt of WA-WB depends on K_a of weak acid and K_b of weak base only.

${\mathrm{p}}^{\mathrm{H}}=7 + \frac{1}{2}{\mathrm{p}}^{\mathrm{K}}\mathrm{a} - \frac{1}{2}{{\mathrm{p}}^{\mathrm{K}}}_{\mathrm{b}}$

Thus p^H remains 6.93