← Back to Chemistry
⚗️
pH Calculator
Calculate pH, pOH, and hydrogen ion concentrations for acids and bases.
pH Calculator
Enter in decimal or scientific notation
pH Scale Guide
pH Scale (0-14)
Acidic (0-7)Neutral (7)Basic (7-14)
Acidic Solutions (pH < 7)
Higher [H+] concentration. Examples: lemon juice (pH 2), vinegar (pH 3)
Neutral Solutions (pH = 7)
Equal [H+] and [OH-]. Example: pure water at 25°C
Basic Solutions (pH > 7)
Higher [OH-] concentration. Examples: ammonia (pH 11), bleach (pH 13)
💡 Key Formulas
- • pH = -log[H+]
- • pOH = -log[OH-]
- • pH + pOH = 14
- • Kw = [H+][OH-] = 1 × 10⁻¹⁴