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When you're using ice box and you are solving for the value of x and you get to the point where you have initial concentration minus x in the denominator of the equilibrium equation, how do you know when you can ignore the x? In what cases is the x negligible and how do you know? Sorry if this was confusing
Usually if the equilibrium constant K is less than 10-3, the addition or subtraction of x to/from your initial value is negligible. But keep in mind that you can only "ignore" x when it is being added to or subtracted from a constant. In other words, if K < 10-3 and it is equal to (x)(x)/(1.00 - x), I can ignore the x in the denominator but not the x values in the numerator.
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