What Mass of Sodium Fluoride Must Be Added to 250

question 25

Multiple Choice

What mass of sodium fluoride must be added to 250.mL of a 0.100 M HF solution to give a buffer solution having a pH of 3.50? [K_a(HF) = 7.1 × 10^-4]

• A)0.49 g
• B)1.5 g
• C)3.4 g
• D)2.3 g
• E)0.75 g

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