An inorganic chemist isolates a compound which she thinks is potassium ferrocyanide: K4Fe(CN)6-3(H2O). she carries out...

An inorganic chemist isolates a compound which she thinks is potassium ferrocyanide: K4Fe(CN)6-3(H2O). she carries out a redox determination for iron yielding the following results: 13.3%, 13.5%, 13.4%, 13.3%, 13.5% Fe by weight. At 95% confidence, has she proven that the compound is not potassium ferrocyanide?

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Expert Solution

According to the formula of potassium ferrocyanide the molecular weight of

According to this molecular weight the mass fraction percentage of iron in compound is

The average yield of iron through redox determination is

The observed mass fraction is very near to calculated mass fraction. Therefore the compound is at 95% confidence potassium ferrocyanide.

queen_honey_blossom answered 2 years ago

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