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Chemistry Help?

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Calculate the pH of a 100 mL solution of 0.100 M acetic acid (HC2H3O2) which has a Ka value of 1.8*10^(-5).
asked Apr 9, 2015 in CHEMISTRY by heather Apprentice

1 Answer

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Step 1:

The concentration of acetic acid is [HCH2H3O2] is 0.100 M.

ka for acetic acid is .

The equation is image.

Equlibrium Constant : image.

image generates one mole of image and one mole of image.

Let image then image.

image

image                   image

image

Step 2:

Find the pH of the solution.

Definition of pH: image.

image

The pH of the solution is 2.8729.

Solution:

The pH of the solution is 2.8729.

answered Apr 9, 2015 by Lucy Mentor

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