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(see attachment) What are (A) and (B)? Give IUPAC name of (A). Find the spin only magnetic momentum of (B)

(see attachment)
What are (A) and (B)? Give IUPAC name of (A). Find the spin only magnetic momentum of (B)

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Grade:10

1 Answers

Jitender Pal
askIITians Faculty 365 Points
8 years ago
Hello Student,
Please find the answer to your question
Fe3+ + SCN- → [Fe(SCN)(H2O)5]2+
(excess) (blood red)
(A)
[Fe(SCN)(H2O)5]2+ + 6F- → [FeF6]3- + SCN-
(B)
IUPAC name of A is pentaaquathiocyanatoferrate (III) ion IUPAC name of B is hexafluoroferrate (III)
In [FeF6]3- oxidation state of Fe = 6
In [FeF6]3- oxidation state of Fe = + 3
∴ It has 5 unpaired electrons, n = 5, Fe3+ is 3d5
Magnetic moment (μ) = √n(n + 2) (B.M.)
√5(5 + 2) = √35 = 5.92 B.M.

Thanks
jitender
askIITians Faculty

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