Lab helper · exact formulas

🧪 pH & Dilution

Convert between pH, pOH, [H⁺] and [OH⁻] on a live color scale, and solve C₁V₁ = C₂V₂ dilutions for any missing value. Mix two solutions, or weigh out solid solute for a target molarity.

pH ↔ concentration

pH

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0714

Dilution C₁V₁ = C₂V₂

C₁ (mol/L)

V₁ (mL)

C₂ (mol/L)

V₂ (mL)

Mix two solutions (same solute)

C₁ (mol/L)

V₁ (mL)

C₂ (mol/L)

V₂ (mL)

Weigh solid for target molarity

C (mol/L)

V (mL)

M (g/mol)

pH assumes 25 °C (Kw = 10⁻¹⁴) and full dissociation for strong acids/bases; below ~10⁻⁷ mol/L water autoionization dominates and the tool warns you. In the dilution card, leave exactly ONE box empty — it becomes the unknown.