What is the pHpH change of a 0.270 M solution of citric acid (pKa=4.77) if citrate is added to a concentration of 0.155 M with no change in volume? Express the difference in pHpH numerically to two decimal places.

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What is the pHpH change of a 0.270 M solution of citric acid (pKa=4.77) if citrate is added to a concentration of 0.155 M with no change in volume?
Express the difference in pHpH numerically to two decimal places.
Expert Solution
Step 1

Henderson-Hassel balch equation

The equation that is used to calculate the pH of a buffer solution is called Henderson-Hassel balch equation

Henderson-Hassel balch equation for an acidic buffer is 

pH=pKa+log[conjugate base][acid][conjugate base]=concentration of conjugate base[acid]=concentration of acidpKa=pKa of acid

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