Question

Calculate the buffering index in the pH range 5-9 for a 0.002 M solution of carbonic...

Calculate the buffering index in the pH range 5-9 for a 0.002 M solution of carbonic acid at 25oC. (Hint: This problem may be solved quickly and easily using a spreadsheet.) Use only Ka1 for this calculation; you may ignore Ka2.

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Answer #1

Solution.

The first dissociation constant of carbonic acid is  4.5 x 10-7; pKa = 6.35;.

The buffer capasity (buffering index) equation is

As

using the values given the equation of a buffering index transforms to

The calculation results are given below:

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