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 .
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