What Mass of NaF Must Be Added to 50

question 99

Multiple Choice

What mass of NaF must be added to 50.0 mL of a 0.500 M HF solution to achieve a pH of 3.25? For HF, K_a = 7.2 × 10^-4.

• A) 1.3 g
• B) 0.69 g
• C) 6.9 g
• D) 23 g
• E) 1.5 g

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