## checking approximation

JustinHorriat_4f
Posts: 111
Joined: Wed Sep 18, 2019 12:19 am

### checking approximation

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
Posts: 100
Joined: Fri Aug 30, 2019 12:17 am

### Re: checking approximation

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
Posts: 109
Joined: Sat Aug 24, 2019 12:15 am

### Re: checking approximation

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
Posts: 99
Joined: Sat Sep 14, 2019 12:17 am

### Re: checking approximation

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

Ian Morris 3C
Posts: 101
Joined: Wed Sep 18, 2019 12:18 am

### Re: checking approximation

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

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