Iron changes oxidation state during the course of this experiment. The iron oxal

Question

Iron changes oxidation state during the course of this experiment. The iron oxalate (step 1 product) has iron in an oxidation state of and the product potassium tris(oxalate) ferrate trihydrate has iron in an oxidation state of The potassium tris(oxalate) ferrate (III) trihydrate product is in water and in ethanol. This allows the product to when ethanol is added to an aqueous solution of the product. In iron(ll) ammonium sulfate hexahydrate, per 1 mole of compound, there are moles of iron and moles of water. Calculate the molar mass of the starting material iron(ll) ammonium sulfate hexahydrate. Report your answer to 4 significant figures.

Explanation / Answer

1)+2;+3

2)soluble in water;insoluble in ethnol;recrystallise

3)1mole of iron;6 moles of water

4)(NH4)2Fe(SO4)2.6H2O

   Nitrogen=2*14=28

   Fe=56

   sulpher=2*32=64

   hydrogen 20*1=20

   oxygen=14*16=224

   1 mole of (NH4)2Fe(SO4)2.6H2O =28+56+64+20+224=392gmole

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