Question

In a solution containing a weak acid, HA, and its conjugate base, A-, the pH of the solution can be calculated from the concentration of the acid and base by the Henderson equation


pH = pK +log((A-)/(HA))


where (HA) and (A-) are the concentrations of the base and conjugate base respectively and pK is a constant.


Calculate the pH of a solution where (HA)= 0.569 mol/L and (A-) = 0.700 mol/L and pK = 4.06 .

Answer 1

pH = 4.06 + log(0.7/0.569) = 4.15