HA is a weak acid and BOH is a weak base. For which of the following salts the extent of hydrolysis is independent of the concentration of the salt in its aqueous solution

The extent of the hydrolysis (h) of the salt made by weak acid and weak base is independent of the concentration of salt.HAweak acid    +      BOHweak  base      →   BA   +    H2O Kh = hydrolysis  constant  =  KwKa Kb