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How many mL of 0.1 M HCl must be added to 100 mL of 0.1 M F- to prepare a buffer solution that has a

How many mL of 0.1 M HCl must be added to 100 mL of 0.1 M F- to prepare a buffer solution that has a pH of 3.05? Ka= 6.8×10^-4. please write it out on paper. i know you need to use pH=pKa+log(conj. base/acid). I do not know what to plug in for conjugate base and the acid.

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