How many grams of ammonium sulfate (NH4)2504 ( Fwt = 132.14 g/mol) should be added to 425 ml of 0.258 M solution of NH3 to achieve a buffer solution with pH of 9.44? Kb for NH3 = 1.8 x. 10A-5. Select one: a. 1.6 x 10A-4 g b. 4.8 g c. 18 g d. 0.029 g

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