checking approximation

[JustinHorriat_4f]

If the K of reaction is less than 10^-3, but when you check your approximation and it is more than 5%, then does that mean you can't approximate and have to use the quadratic formula?

[Myka G 1l]

Yes, if the x value divided by the initial value comes out to be more than 5% then you have to go back and do the quadratic formula to solve.

[vpena_1I]

That is correct, though it is not very common. The initial molarity of the reactants would have to be pretty small for that to happen.

[SimranSangha4I]

Yes, if the answer comes back more than 5% you should go back and use the quadratic formula.

[Ian Morris 3C]

Yes, it doesn't happen often but it is best to always check.