15.23 b

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Andrea Grigsby 1I
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Joined: Fri Sep 29, 2017 7:03 am

15.23 b

Postby Andrea Grigsby 1I » Wed Mar 07, 2018 9:27 pm

Why is the formula used for this question ln[A]0 / [A]t , instead of ln [A]t/[A]0?

Angela 1K
Posts: 80
Joined: Fri Sep 29, 2017 7:05 am

Re: 15.23 b

Postby Angela 1K » Wed Mar 07, 2018 9:42 pm

I used the equation and got the same answer as the solutions manual. I think the two equations are equivalent because of the negative sign I used in my answer, when transferred to the other side, would flip the two concentrations.

David Zhou 1L
Posts: 61
Joined: Fri Sep 29, 2017 7:04 am

Re: 15.23 b

Postby David Zhou 1L » Fri Mar 09, 2018 4:50 pm

It's just algebraic manipulation; flipping the numerator and denominator will give you the negative log value.

Jenny Cheng 2K
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Re: 15.23 b

Postby Jenny Cheng 2K » Fri Mar 09, 2018 10:22 pm

If you make both sides of the equation ln([A]t/[A]0) = -kt negative, you will have: ln([A]0/[A]t) = kt. Making the natural log negative flips the content because:
ln([A]t/[A]0) = ln[A]t - ln[A]0

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