The ionization constant of formic acid is 1.8xx10^(-4). Around what pH will its mixture with sodium formate give buffer solution of highest capacity ?

The ionization constant of formic acid is 1.8xx10^(-4). Around what pH

1.	The ionization constant of formic acid is 1.8xx10^(-4). Around what pH will its mixture with sodium formate give buffer solution of highest capacity ?
Answer» Solution :Buffer solution of HIGHEST capacity is formed at which `PH = pK_(a)=- LOG (1.8xx10^(-4) ) = 3.74`.