Equilibrium Lab 1. Fe 3+ + SCN - <=> FeSCN 2+ 2. Fe 3+ + 2SCN - <=> Fe(SCN) 2 +

ID: 1025720 • Letter: E

Question

Equilibrium Lab

1. Fe3+ + SCN- <=> FeSCN2+

2. Fe3+ + 2SCN- <=> Fe(SCN)2+

Q.Based on the calculated values for K(equilibrium constant) for these 2 reactions, which reaction is the right one?

I first thought the first equation is right because it is bimolecular.

When I compared the difference between the average value of Kc and individual Kc , the 2nd equation had a big difference than the 1st equation.

But I feel I'm not sure about this result because of the malfunctioning of our device(spectrophotometer).

Is the way that I think right?

If it is right, please explain why this is true.

The first reaction is correct.

Because Ferric ion (Fe3+) reacts with only one isothiocynate ion.

Since you have already mentioned the malfunctioning of Spectrophotometer, it may be error.

This is also concentration dependent, you recheck your experiment once again.

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