Is Approximation appropriate when the equilibrium constant is 1 x 10-2?

Yes, the actual answer is 1.881 x 10-2, the approximate answer is 2.000 x 10-2

The approximate answer is more than 5% of the smaller initial concentration (0.2 M) so the approximation is not valid in this case, according to the text. However, the anwer is 10% of the smaller value, and so is probably on the upper limit of acceptability according to the instructor :-).

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