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pH definition
pH = −log[H3O+]
pOH definition
pOH = −log[OH−]
Relationship at 25°C
pH + pOH = 14
Neutral solution at 25°C
[H3O+] = 1.0 × 10^−7 M, pH = 7
If [H3O+] > 1.0 × 10^−7
Acidic
If [H3O+] < 1.0 × 10^−7
Basic
If pH < 7
Acidic
If pH > 7
Basic
If pOH < 7
Basic
If pOH > 7
Acidic