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6A.19

Posted: Mon Jan 13, 2020 11:35 pm
by Connor Ho 1B
Calculate the molar concentration of OH in solutions with the following molar concentrations of H3O+:

c) 3.1 M

In the solutions manual, it says you divide 10-14 by 3.1 x 10-3 to get 3.2 x 10-12. Is this an error with the solutions manual/textbook (because the molarity of H3O+ does not match between the solutions manual/textbook), or am I missing something to calculate the OH- concentration?

Re: 6A.19

Posted: Mon Jan 13, 2020 11:42 pm
by Prasanna Padmanabham 4I
that's confusing...hmm...did it say millimolars? I'm interested in an answer too...

Re: 6A.19

Posted: Mon Jan 13, 2020 11:44 pm
by nicolely2F
Pretty sure the textbook question should be 3.1x10^-3 instead of just 3.1, since all the units are the same (L) and it's otherwise just plugging numbers in.

Re: 6A.19

Posted: Tue Jan 14, 2020 12:09 am
by Subashni Rajiv 1K
Yeah, when I did this problem, I got 3.2x10^-15.

Re: 6A.19

Posted: Tue Jan 14, 2020 1:33 am
by Ryan Lee 1E
I got a 10^-15 value as well. Seems the solutions manual is off.

Re: 6A.19

Posted: Tue Jan 14, 2020 10:08 am
by Jessica Esparza 2H
I was looking at this too! Either they forgot to add mM to the problem or it is an error in the solutions manual. I got the answer to the ^-15.

Re: 6A.19

Posted: Tue Jan 14, 2020 11:55 pm
by Donna Nguyen 2L
I was having the same problem! It's probably just a mistake in the solutions manual.