k = A e -E a /RT

k = Ae-Ea/RT

Titration Curves

Weak acid with strong base:

Strong acid with weak base:

http://www.chemguide.co.uk/physical/acidbaseeqia/phcurves.html

Acid-base EquilibriaImportant Equations:

Self-ionization of water:

H2O H+ + OH-

Kw = [H+][OH-] = 1.0 x 10-14

Acid dissociation:

HA H+ + A-

[HA]]-][A[H

aK

Base dissociation (e.g. NaOH, KOH):

BOH B+ + OH-

[BOH]]-][OH[B

bK

Base hydrolysis (e.g., NH3):

B + H2O BH+ + OH-

HA + H2O H3O+ + A-

[HA]]-][AO3[H

aK

[B]]-][OH[BH

bK

Acid-base Equilibria (cont’d)

Hydrolysis of the conjugate base of an acid:

In a buffer system:

]-[A[HA]][H aK

A- + H2O HA + OH-

]-[A]-[HA][OHbK

]-[A]-[HA][OH

[HA]]-][A[H

baKK

= [H+][OH-] = Kw

Note that:

]-[A

[HA] logppH aK

[HA]]-[A logppH aK