140. Задачка по химии №014 031

91. Thallium was transferred from a weighed portion of a sample weighing 2.04 g to Tl and titrated with 0.1 N KBrO3 solution in hydrochloric acid medium:
BrO3⎯ 3Tl 6H = Br⎯ 3Tl3 3H2O
Calculate the percentage of thallium in the alloy from the following potentiometric titration results - Table 27.
Table 27

V, ml
(KBrO3) 2.0 10.0 18.0 19.8 20.0 20.2 22.0
E, mV 1251 1280 1309 1339 1407 1430 1451

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