Calculate the concentration of H3O
+ present
in 0.377 M H2CO3.
Answer in units of mol/L
I know the Ka of H2CO3 is 4.3E-7. But I don't know what to do from there. (Or, I'm not getting the correct answer at least)
4 answers
When you have problems like this post your work. That way we can see at a glance what is wrong.
Well, I've tried going using 4.3e-7=x^2/0.377 to get to what x equals, I've been getting 0.0069, but it's incorrect.
Once again I was foolish and mistyped an earlier answer, getting 4.02e-4 for my answer. I had not put in the 0 between the 4 and the 2 when submitting.
Your set up is ok. My answer is 4.026E-4M. However, you're allowed only two significant figures (set by the 4.3E-7 Ka value) so I would round that to 4.0E-4M. I suspect the s.f. thing is catching you.
1 answer