You wish to prepare 125 milliliters of 0.0500 M phosphatebuffer pH 7.90 from pho

You wish to prepare 125 milliliters of 0.0500 M phosphatebuffer pH 7.90 from phosphoric acid [a liquid; specific gravity =1.69 assay by weight = 85.6%; MW = 97.999] and potassium hydroxide[a solid; purity 86%; MW = 56.11].