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### checking approximation

Posted: **Sun Jan 26, 2020 11:32 pm**

by **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?

### Re: checking approximation

Posted: **Sun Jan 26, 2020 11:36 pm**

by **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.

### Re: checking approximation

Posted: **Sun Jan 26, 2020 11:36 pm**

by **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.

### Re: checking approximation

Posted: **Sun Jan 26, 2020 11:40 pm**

by **SimranSangha4I**

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

### Re: checking approximation

Posted: **Mon Jan 27, 2020 1:48 am**

by **Ian Morris 3C**

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