2.a) What is the oxidation state of iron in Fe(NH4)2(SO4)2 X 6H2O? Justify your
ID: 730794 • Letter: 2
Question
2.a) What is the oxidation state of iron in Fe(NH4)2(SO4)2 X 6H2O? Justify your answerb.) Is the iron being oxidized or reduced in the reaction in question 1?
6.)In the following balanced equation, AB is the only colored species. All other species/reagents are colorless. If the goal of an experiment is the determination of the percentage of D in an impure sample of the salt, MD and the experiment technique to combine reagents for this determination is a titration, identify the reagent that will form the titrant? Justify your answer.
Equation: AB + D- > AD + B-
Explanation / Answer
H is +1 and O is -2. Then there are the known ion groups, ammonium, NH4, is +1 and sulfate, SO4 is -2. From that you can figure out what the oxidation numbers are for S (4 x -2 is -8 so the S must be +6 to give an overall ox. no. of -2) and for N (4 x 1 is +4 so N must be -3 to give you an overall charge of +1). The only one left is Fe, so with 2 x +1 for ammonium and 2 x -2 for sulfate, you get the charge for Fe at +2.
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