17. Solving a chemistry problem
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206. From a weighed sample of steel, manganese was transferred to MnO4 and titrated with a 0.005 N solution of sodium oxalate Na2C2O4: MnO4 5C2O42 8H Mn 2 10 CO2 4H2O. Calculate the percentage of manganese in steel from the following potentiometric titration data:
Solution volume
Na2C2O4, ml 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0
E, mV 176 190 230 289 387 435 487 512
Solution volume
Na2C2O4, ml 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0
E, mV 176 190 230 289 387 435 487 512
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