February 27, 2017

Homework Help: Food Chemistry

Posted by Lauren on Thursday, April 29, 2010 at 10:34am.

Calculate the amounts and pH values for preparing the following acetic acid/acetate buffer solution.

1.) In the first step, If you plan to prepare a 2.00 M sodium acetate in 200.0 mL distilled water, how many grams of sodium acetate should be added in water?

2.) B. In the 2nd step, if 1.00M acetic acid will be added in the above solution, what will the pH value of the acetic acid/sodium buffer solution be? Assuming the change in volume will not be significant when all the chemicals are added, and the dissociation value (Ka) of acetic acid is 1.78x10-5

3.) C. If you plan to use the above stock solution from the 2nd step to prepare a new buffer solution in pH=4.50, how many additional moles of acetic acid should be added in this 200.0 mL solution. Assuming the change in volume will not be significant?

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