140. Задачка по химии №014 031

92. From a sample of ore weighing 0.80 g, uranium was converted into U4 and titrated with 0.01N KMnO4 solution:
2MnO4⎯ 5U4 2H2O = 2Mn2 5UO2 2 4H
Calculate the percentage of uranium in the ore from the following potentiometric titration results - Table 28.
Table 28

V, ml
(KMnO4) 2.0 10.0 18.0 19.8 20.0 20.2 22.0
E, mV 301 330 359 389 1173 1486 1498

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