Relative Acid-Base Strength and Reaction Direction
General Rule: An acid-base reaction proceeds to the greater extent in the direction in which a stronger acid and stronger base form a
weaker acid and a weaker base.
H2S + NH3 HS- + NH4+
Kc > 1
A competition for the proton between the two bases!
HF + H2O F- + H3O+
Kc < 1
a
b
b
a
a
b
b
a
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