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In PURE water
[H+]= [OH-]
pH equation
pH = -log[H+]
if pH is less than 7
Acid
If pH is 7
neutral
if pH is greater than 7
Base
pOH is equal to
pOH = -log[OH-]
For pH
pH ⇄ [H⁺]
For pOH-
pOH ⇄ [OH⁻]
For another pH
pH ⇄ pOH
CHEAT SHEET H+
[H+]=10−pH
CHEAT SHEET OH-
[OH−]=10−pOH
CHEAT SHEET pH
pH=14−pOH
Ka for
weak acid
You can use HA when:
They say “a weak acid”
They give Ka or pH
K
Ka=10-pka