posted by Jematormal91 .
Calculate the pH of a buffer solution obtained by dissolving 16.0 g of KH2PO4(s) and 27.0 g of Na2HPO4(s) in water and then diluting to 1.00 L. (pKa=7.21)
Convert grams to mols. mols = grams/molar mass.
Then pH = pKa + log(base)/(acid) and solve for pH.