1. choose two of the acids listed, one monoprotic, the other diprotic. write the reactions that occur when each of them react with a solution of naoh. 2. to standardize a solution of naoh, one uses a primary standard called potassium hydrogen phthalate (khp for short). it is a monoprotic acid that can be obtained extremely pure and dried to a constant weight. it has a molar mass of 204.33 g/mol. suppose you weigh out 0.556 g of khp and dissolve it in water. it requires 14.48 ml of naoh solution to reach the endpoint. what is the concentration of the naoh solution? 3. the naoh solution from #2 above is used to titrate a diprotic acid solution of unknown concentration. 25.00 ml of the acid solution requires 26.54 ml of naoh solution. what is the concentration of the acid solution?