K3Fe(C204) 3.3H20 PRELIMINARY QUESTIONS 1. what is the theoretical percent iron
ID: 535077 • Letter: K
Question
K3Fe(C204) 3.3H20 PRELIMINARY QUESTIONS 1. what is the theoretical percent iron in potassium iron(II) oxalate? 2. What is the purpose of the hydroxylamine solution that is added to the unknown solution in the iron analysis? 3, what is the function of the phenanthroline solution that is added to the unknown iron solution? 4. If5.00 ml of a solution containing 4.00 x 10-2 M iron is placed in a 100.0 ml volumetric flask and filled to the mark with deionized water, what will be the concentration of iron in this new solution? 313Explanation / Answer
1.
K3[Fe(C2O4)3]
has a molar mass of 437.20 g/mol
the molar mass of Iron is 55.845
the theoretical percent iron in Potassium Iron (III) oxalate
(55.845 g Fe) / (437.20 g/mol K3[Fe(C2O4)3] ) times 100 = 12.77 % Fe
2. Hydroxylamine is a reagent that helps reduce iron, Indicators contain chemicals that will react with certain substances. If that substance is present in your unknown solution, a reaction will occur. If no reaction occurs, then that substance is not present in your solution.
3. Phenanthroline is used as a redox indicator. Indicators contain chemicals that will react with certain substances. If that substance is present in your unknown solution, a reaction will occur. If no reaction occurs, then that substance is not present in your solution.
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