93. From a sample of an alloy weighing 1.20 g, iron was transferred to Fe2 and titrated with 1.0 N solution of Ce (SO4) 2: Ce4 Fe2 = Ce3 Fe3 Calculate the percentage of iron in the alloy according to the following results of potentiometric titration - table;
V, ml (Ce (SO4) 2) 2.0 10.0 18.0 19.8 20.0 20.2 22.0
E, mV 712 771 830 889 1110 1332 1391
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