6A.19

[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?

[Prasanna Padmanabham 4I]

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

[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.

[Subashni Rajiv 1K]

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

[Ryan Lee 1E]

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

[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.

[Donna Nguyen 2L]

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