Answer to Question #58555 in Other Chemistry for Emma

Question #58555
The Ka for methanoic acid, the chemical that causes the sting in insect bites, is 1.8 x 10^-4. Calculate the pH of a 0.40 mol/L methanoic acid solution.
1
Expert's answer
2018-06-06T08:09:14-0400
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Comments

Assignment Expert
06.06.18, 15:08

Dear Jane
Thank You

Jane
04.06.18, 18:35

There is a mechanical error in the 5th line of the solution, after, "we get:". The molar concentration is c=0.40 according to the question but, in this line it was written as c=0.04. This alters the final answer from pH=2.07 to pH=2.57. Other then this the question is answered well.

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