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140. Solving a chemistry problem

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94. A solution was transferred from a sample of steel, weighing 2.00 g, and titrated with a 0.1N solution of iron (II) sulfate:
VO2 + + Fe2 + + 2H + = VO2 + + Fe3 + + H2O
Calculate the percentage of vanadium in the alloy from the following potentiometric titration results - Table 30.
Table 30

V, ml
(FeSO4) 2.0 10.0 18.0 19.8 20.0 20.2 22.0
E, mV 1058 999 940 901 885 841 830
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