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Methylamine (CH3NH2) is a weak base whose conjugate acid has a pKa of 10.64. What mass (in grams) of methylammonium chloride (CH3NH3Cl, MW = 67.52 g/mol) needs to be added to 50.0 mL of 0.100 M solution of methylamine in order to prepare a buffer solution with a pH of 10.20? preparing buffer of weak acid