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

Question

Question 6

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

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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:

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Question 8

What is the oxidation state of C in oxalate ion, C2O42-?

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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?

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Question 10

The coordination compound being synthesized is green in color. What color of light does this compound absorb the strongest?

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Question 11

FeC2O4 is insoluble in water. What color is FeC2O4(s)?

Explanation / Answer

Q 6) Ans - b

Q 7) Ans- Lewis acid

Any species which accepts a pair of electrons is called Lewis acid.

Therefore,  Fe3+ is serving as lewis acid.

Q8) Ans - +3

C2O4-2

2C + 4(-2) = -2

2C = -2+8

2C = +6

C = +3

Therefore, oxidation state of C in oxalate ion, C2O42- = +3

Q9) Ans- Peemanganate ion

The balanced chemical equation for reaction between MnO4- and C2O42 is

2MnO4- + 16H+   + 5C2O42   ------------> 2Mn+2   + 8H2O + 10CO2(g)

Oxidising agent: The substance which get reduced in the reaction by oxidising other species.

Here, oxidation state of Mn in MnO4- = +7

In the above reaction, oxidation state of Mn reduced from +7 to +2.

Therefore, MnO4- (permanganate ion) is the oxidising agent.

Q10) Ans- red

Green color compound strongly absorb red color.

Q11) Ans- yellow

FeC2O4(s) is a yellow powder.

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