Problem: What mass of ammonium chloride (NH 4Cl, molar mass 53.5g/mol) must be added to a 0.500mL solution of 0.250M ammonia to make a buffer with a pH of 9.26?

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What mass of ammonium chloride (NH 4Cl, molar mass 53.5g/mol) must be added to a 0.500mL solution of 0.250M ammonia to make a buffer with a pH of 9.26?