Assuming No Volume Change on Mixing, What Mass of Ammonium

question 62

Multiple Choice

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

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