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Use the mean value of 537 for Keq to calculate the SCN− concentration in a solution...

Use the mean value of 537 for Keq to calculate the SCN− concentration in a solution whose initial Fe3+ concentration was 3.90×10−02 M and initial SCN− concentration was 1.00×10−03 M .

Fe3+ + SCN− ⇌ FeNCS2+

I used the ice chart and determined that:

537 = x/(0.039-x)(0.001-x)

Please help me understand how to solve this question.

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