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PH and Buffers.

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Presentation on theme: "PH and Buffers."— Presentation transcript:

1 pH and Buffers

2

3

4 HA NaOH A H OH Na+ H2O

5 A HCl 0.1-X X H Cl- X X HA X

6 M NaOH ® pH pKa 4.76 2.88

7 How would you choose a good buffer for an enzyme that is active at a
particular pH? Compare the pKas. Acid/base pKa Carbonic acid pK Bicarbonate pK Acetate Imidazole Tris Ammonium Phosphate pK Phosphate pK Phosphate pK

8

9

10 Summary The Henderson-Hasselbach equation relates pH to concentrations of conjugates of weak acids and bases. Titrations of weak acids and bases identify the pKa (and pKb). Any weak acid or base provides a pH buffer around its pKa.

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