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.

${\mathrm{p}}^{\mathrm{H}}$ of a salt of WA- WB  is independent of concentration of the salt.

${\mathrm{p}}^{\mathrm{H}}$ of a salt of WA-WB depends on ${\mathrm{K}}_{\mathrm{a}}$ of  weak acid and ${\mathrm{K}}_{\mathrm{b}}$ 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 ${\mathrm{p}}^{\mathrm{H}}$remains 6.93 ;