Homework error?

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sarahtang4B
Posts: 132
Joined: Fri Sep 28, 2018 12:27 am

Homework error?

Postby sarahtang4B » Tue Jan 15, 2019 12:57 pm

On problem 6A19 part c of 7th edition, the solutions manual says the concentration given is 3.1e-3 when the textbook gives the concentration as just 3.1 mol per liter.

Which concentration do we use? am I just missing a step in solving??

Sarah Zhao 4C
Posts: 64
Joined: Fri Sep 28, 2018 12:28 am

Re: Homework error?

Postby Sarah Zhao 4C » Tue Jan 15, 2019 3:06 pm

I would use whichever one gets you to the answer in the solution manual. You made need to do the problem with both concentrations to determine if it was a typo or if they used the 10^-3 number throughout the whole problem.

abbydouglas1K
Posts: 65
Joined: Fri Sep 28, 2018 12:26 am

Re: Homework error?

Postby abbydouglas1K » Thu Jan 17, 2019 9:23 pm

I'm glad I'm not the only one who thought this because if you do divide Kw by 3.1 mol/l you get a concentration with a value of 10^-15 which I'm not sure is possible


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