Question 6 What is the purpose of ammonium acetate when complexing Fe with o-phe

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Question 6 What is the purpose of ammonium acetate when complexing Fe with o-phenanthroline in the digested cereal sample? It absorbs some light Fe does not. To reduce the concentration of H+ because H+ may hinder the complexation reaction ammonium acetate helps the complexed Fe to dissolve better To get rid of some other ions in the cereal sample

-------------------------------------------------------------------------------------------------------- Question 7

When forming [Fe(C2O4)3]3- complex in coordination compound lab, oxalate ions are donating lone pairs to central metal Fe3+ to form coordinate bonds. In this process Fe3+ is serving as: catalyst Lewis acid Lewis base ligand -------------------------------------------------------------------------------------------

Question 8 What is the oxidation state of C in oxalate ion, C2O42-? +3 +2 -2 +4 0 ----------------------------------------------------------------------------------------------------

- Question 9 The coordination compound lab is a two-week lab. During the second week of this lab (after we complete Computational Modeling lab) , we will use KMnO4 to titrate oxalate ion and then use the titration data to calculate the %purity of the coordination compound being synthesized. In this titration reaction between MnO4- and C2O42-, what is the oxidizing agent? carbon dioxide Mn^2+ ion permangnate ion oxalate ion H ion -----------------------------------------------------------------------------------------------------

Question 10 The coordination compound being synthesized is green in color. What color of light does this compound absorb the strongest? green orange violet red blue ------------------------------------------------------------------------------------------------------ Question 11 FeC2O4 is insoluble in water. What color is FeC2O4(s)? white red yellow brown green

Explanation / Answer

Question 6) What is the purpose of ammonium acetate when complexing Fe with o-phenanthroline in the digested cereal sample?

Answer: Ammonium acetate acts as buffer here. It maintains the pH.

Question 7) Fe+3 acts as lewis acid, as lewis acid is the one which accepts electrons.

Question 8)

Oxidation state of carbon in oxalate ion

LEt the oxidation state = x

C2O42-

2x + 4(-2) = -2

2x = +6

x=+3

Question 9)

MnO4- or permangnate ion is oxidizing agent which itself gets reduced to +2

Question 10) REd colour absrobed

Question 11)

White

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