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The iron(II) ion can coordinate with six cyanide ions. How many potassium ions can form ionic...

The iron(II) ion can coordinate with six cyanide ions. How many potassium ions can form ionic bonds with this polyatomic ion to form a neutral compound?

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Answer #1

Let x Potassium bonds with this polyatomic ion

So

Formula of compound is

Kx[Fe(CN)6]

Oxidation state of one CN = -1

Oxidation state of 6 CN = - 6

Oxidation state of one K = + 1

Oxidation state of x K = + x

According to question , oxidation state of Fe = +2

For neutral compound ,

Sum of all oxidation state = 0

Oxidation state of x potassium + oxidation state of iron + oxidation state of 6 CN = 0

x + (+2) + (-6) = 0

x = 4

So 4 Potassium bonds with this polyatomic ion

And formula is

K4[Fe(CN)6]

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