The potassium ion in a 250.0-mL sample of mineral water was precipitated with
sodium tetraphenylborate:
K+ + B(C6H5)4- → KB(C6H5)(s)
The precipitate was filtered, washed, and redissolved in an organic solvent. An excess of the mercury(II)/
EDTA chelate was added:
4HgY2- + B(C6H4)4- + 4H2C → H3BO3 + 4C6H5Hg+ + 4HY3- + OH-
The liberated EDTA was titrated with 29.64 mL of 0.05581 M Mg21. Calculate the potassium ion concentration in parts per million.
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