## 6A.19

Connor Ho 1B
Posts: 102
Joined: Sat Aug 17, 2019 12:17 am

### 6A.19

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?

Posts: 111
Joined: Thu Jul 25, 2019 12:17 am

### Re: 6A.19

that's confusing...hmm...did it say millimolars? I'm interested in an answer too...

nicolely2F
Posts: 149
Joined: Sat Sep 14, 2019 12:17 am

### Re: 6A.19

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.

Subashni Rajiv 1K
Posts: 101
Joined: Wed Sep 18, 2019 12:16 am

### Re: 6A.19

Yeah, when I did this problem, I got 3.2x10^-15.

Ryan Lee 1E
Posts: 50
Joined: Sat Aug 17, 2019 12:16 am

### Re: 6A.19

I got a 10^-15 value as well. Seems the solutions manual is off.

Jessica Esparza 2H
Posts: 130
Joined: Wed Sep 18, 2019 12:15 am

### Re: 6A.19

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.

Donna Nguyen 2L
Posts: 100
Joined: Sat Aug 24, 2019 12:17 am

### Re: 6A.19

I was having the same problem! It's probably just a mistake in the solutions manual.