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Chemistry Help?

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A buffer is made by adding 0.300 mol HC2H3O2 and 0.300 mol NaC2H3O2 to enough water to make a 1 L of solution. The pH of the buffer is 4.74. Calculate the pH of this solution after 0.020 mol NaOH is added.
asked Apr 9, 2015 in CHEMISTRY by heather Apprentice

1 Answer

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Step 1:

The initial amount of [HC2H3O2] is 0.3 mol.

The initial amount of [NaC2H3O2] is 0.3 mol.

The chemical equation is .

pH of the buffer solution when no NaOH is added is 4.74.

image.

Now 0.02 mol of NaOH is added.

Initial Amount image image image
Change in Amount image image image
Equilibrium amount image image

image

Step 2:

Concentration of [HC2H3O2] is image.

Concentration of [NaC2H3O2] is image.

Definition of pH:

image

image

pH of the solution is 4.4.79799

Solution:

pH of the solution is 4.79799.

answered Apr 9, 2015 by Lucy Mentor

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