1.Calculate the pH of a solution that is 0.120 M in aceticacid , HC 2 H 3 O 2 ,

Question

1.Calculate the pH of a solution that is 0.120 M in aceticacid , HC2H3O2, and 0.210 M insodium acetate, NaC2H3O2 The Ka ofacetic acid is 1.76 x 10-5. 2. How many grams of sodium acetate must be added to 100ml of0.150 M in sodium acetic acid in order to produce a solution with apH of 4.620? Assume that the volume change occurs. 1.Calculate the pH of a solution that is 0.120 M in aceticacid , HC2H3O2, and 0.210 M insodium acetate, NaC2H3O2 The Ka ofacetic acid is 1.76 x 10-5. 2. How many grams of sodium acetate must be added to 100ml of0.150 M in sodium acetic acid in order to produce a solution with apH of 4.620? Assume that the volume change occurs.

Explanation / Answer

(1) We know pH = pKa + log ( [ salt] / [ acid])
                          = - log Ka + log ( [ salt] / [ acid] )                           = - log 1.76 * 10^-5   + log ( 0.210 / 0.120 )                           = 5 - log 1.76 + log 1.75                           = 5 - 0.2455 + 0.2430                           = 4.99

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