Hydrolysis & buffers.

Prezentacja na temat: "Hydrolysis & buffers."— Zapis prezentacji:

1 Hydrolysis & buffers

2 Hydrolysis Reaction of ions with water molecules resulting in the decomposition of water molecule to release hydrogen or hydroxyl ion. Acidification or alkalinization of the aqueous solution it is thus possible.

3 Hydrolysis

4 Hydrolysis

5

6 Strong acid/weak base

7 Strong acid/weak base

8 Ammonium chloride

9 Aluminum sulfate (VI)

10 Weak acid/strong base

11 Weak acid/strong base

12 Sodium acetate

13 Sodium carbonate

14 Weak acid/weak base

15 Weak acid/weak base

16 Weak acid/weak base

17 Weak acid/weak base

18 Weak acid/weak base Hydrolysis efect, pH, of the weak acid and a weak base salt solution, depends on the of the respective dissociation constants of the acid and base.

19 Ammonium acetate

20 Ammonium acetate The pH of the solution will depend on the dissociation constant of acetic acid and the ammonium base and the ionic product of water. Because these constants little different from each other, pH of the solution practically neutral (pH about 7).

21 Buffer solutions Solutions retaining the pH constant and insensitive to small additions of acids and bases. These are usually solutions of weak acids and their salts, or weak bases and their salts.

22 Buffer solution Response of the buffer solution prepared on the basis of a weak acid HA and coupled to this acid anion A- (principle as defined Bronsted) involves the binding of an excess of H+ and HO- by reacting:

23 Buffer solution The pH of this buffer solution can be determined by appropriate selection of the concentration of a weak acid HA and its conjugated base, using the equilibrium constant for the dissociation of acid

24 Buffer solution

25 Acetate buffer

26 Ammonium buffer

27 Sources

28 Hydrolysis & buffers