Assuming no volume change on mixing, what mass of ammonium chloride should be added to 250.0 mL of 0.25 M ammonia to produce a solution of pH 10.70? [Kb for ammonia is 1.8 × 10-5]
A) 3.7 mg
B) 120 mg
C) 40 mg
D) 30 mg
E) 80 mg
Correct Answer:
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