What Mass of Sodium Fluoride Must Be Added to 250

question 145

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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