Question: 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

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

K* + (C,H5)4B : KB(C,H5)4(s)


The precipitate was filtered, washed, dissolved in an organic solvent, and treated with excess Hg(EDTA)2-:

K* + (C,H5)4B : KB(C,H5)4(s)


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.

K* + (C,H5)4B : KB(C,H5)4(s)

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