# A buffer solution contains 0.311 M NaHCO3 and 0.297 M Na2CO3. Determine the pH change when 0.068 mol KOH is added to 1.00 L of the buffer.pH after addition − pH before addition = pH change =

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A buffer solution contains 0.311 M NaHCO3 and 0.297 M Na2CO3. Determine the pH change when 0.068 mol KOH is added to 1.00 L of the buffer.

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Step 1

Initially, the buffer solution contains 0.311  NaHCO3 and 0.297 M Na2CO3. Na2CO3. The pH of this buffer solution may be determined by using Henderson equation as follows :

Step 2

When KOH(a base) is added to the buffer solution, it reacts with the acid as:

Step 3

Thus, on addition of KOH to the buffer solution, an equivalent amount of the acid reacts (hence its concentration decreses by an equivalent amount) and an equiva...

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