140. Solving a chemistry problem

140. Solving a chemistry problem

14. A sample of aluminum weighing m g was dissolved and the Fe3 + ions contained in the form of an impurity were titrated with Sn2 + ions obtained at a constant current of 4.0 mA.The equivalence point was fixed by a potentiometric method, the electrolysis time t was determined by a chronometer.
Determine the mass fraction (%) of iron in aluminum according to the following data:
Option 1
m, g 1,000
t, s 100

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