Potassium ion in a 250.0 (0.1) mL water sample was precipitated with sodium

Chapter 11, Problem 11-A

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Potassium ion in a 250.0 (0.1) mL water sample was precipitated with sodium tetraphenylborate: The precipitate was filtered, washed, dissolved in an organic solvent, and treated with excess Hg(EDTA)2: The liberated EDTA was titrated with 28.73 (0.03) mL of 0.043 7 (0.000 1) M Zn2. Find [K] (and its absolute uncertainty) in the original sample. 11

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