Question- the f- concentration of a solution was determined, Chemistry

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Question- the f- concentration of a solution was determined

Question- The F- concentration of a solution was determined by measurement with a liquid-membrane electrode. The electrode system developed a potential of 0.4965V when immersed in 25mL of the sample, and 0.4117 after addition of 2mL of 5.45 x 10-2 M NaF. Calculate pF for the sample.

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