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🧪 pH Calculator

Calculate pH, pOH, [H+], and [OH-] for acids and bases

pH from H+ Concentration

pH from OH- Concentration

Complete pH Analysis

Strong Acid/Base Calculator

pH Scale Reference

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Key Relationships:

pH + pOH = 14 (at 25°C)

pH = -log[H+]

pOH = -log[OH-]

[H+] × [OH-] = 1.0 × 10⁻¹⁴ (Kw at 25°C)

Acidic
pH < 7
[H+] > [OH-]
Neutral
pH = 7
[H+] = [OH-]
Basic
pH > 7
[H+] < [OH-]