Acid dissociation constant
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1
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What is the acid dissociation contsant (Ka)?
An equilibrium constant for weak acids that relates [HA] to [H+].
2
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What equilibrium is established when weak acids dissociate?
HA(aq) -><- [H+](aq) + A-(aq)
3
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What is the expression for Ka?
Ka = [H+][A-]/[HA]
4
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Why is Ka necessary?
Weak acids only dissociate partially in solution so [H+] doesn't equal acid concentration.
5
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How can the Ka expression be simplified?
Ka = [H+]2/[HA]
6
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What is pKa and what can it tell you about an acid's pH?
pKa is a logarithmic constant which can be calculated from Ka for comparison. A high pKa indicates a low pH.
7
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How can pKa be calculated from Ka?
pKa = -log10(Ka)
Ka = 10-pKa (to the power of)