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]

Name: 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 ]
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The Answer of 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]

What Mass of Sodium Fluoride Must Be Added to 250