🧪 pH Calculator
Convert between pH, pOH, hydrogen ion concentration [H⁺], and hydroxide ion concentration [OH⁻].
Understanding pH
pH is a measure of the acidity or basicity of a solution, defined as pH = -log₁₀[H⁺]. The pH scale typically ranges from 0 to 14, where 7 is neutral, values below 7 are acidic, and values above 7 are basic. The relationship pH + pOH = 14 holds at 25°C, and [H⁺] × [OH⁻] = 1.0 × 10⁻¹⁴ (the water autoionization constant Kw).
How This Calculator Works
Enter any one of pH, pOH, [H⁺], or [OH⁻] and this calculator will compute all four values. This is useful for chemistry students, lab work, water quality testing, and understanding acid-base chemistry.
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