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Biochemistry Forum Discuss and post questions regarding the study of Biochemistry. If you need homework help this is the place to ask!

Buffer Question

Buffer Question - Biochemistry Forum

Buffer Question - Discuss and post questions regarding the study of Biochemistry. If you need homework help this is the place to ask!

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Old 10-06-2011, 05:25 PM
Pipette Filler
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Default Buffer Question

I am struggling on my last homework question and I need some help.
The question states:
One liter of 1M acetate buffer at pH=4.5 is mixed with 600mL of 0.5M acetate buffer at pH=4.8. Then, one liter of HCl (0.1M) is added. What is the pH of the final solution?

I know that buffer can eliminate effects due to addition of smaller quantities of acid and base. Acetic acid is a weak acid and in presence of smaller quantity of added acid, some of the acetate ions of acetate buffer produce weak acetic acid. This encourages more acetate ions to be produced and thereby maintains the ratio {[salt]/[acid]} unchanged. Thus, the effect of addition of acid is neutralised.

I originally wanted to put pH=4.76 (as my given acetic acid pH) since I know mostly acetic acid will be made, but the amounts are making me think it might be a little more complicated.

Thank you in advance!
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