Calculate pH, pOH, hydrogen ion concentration [H⁺], and hydroxide ion concentration [OH⁻].
Enter a value and select input type, then click Calculate.
The pH of a solution is a measure of its acidity or basicity, defined as pH = -log₁₀[H⁺], where [H⁺] is the concentration of hydrogen ions in moles per liter. The pOH is defined similarly: pOH = -log₁₀[OH⁻]. At 25°C, pH + pOH = 14 (the water ion product constant, Kw = 1×10⁻¹⁴). A pH of 7 is neutral (pure water), below 7 is acidic, and above 7 is basic (alkaline). The calculator allows input of pH, pOH, [H⁺], or [OH⁻] and computes all other values. This is essential for chemistry, biology, environmental science, medicine, and water quality analysis. Understanding pH is crucial for reactions, buffers, and many biological processes.
- Select the Input Type from the dropdown: pH, pOH, [H⁺], or [OH⁻].
- Enter the corresponding Value (e.g., 7.0, 3.5e-4).
- Click Calculate to compute all related values.
- The result shows pH, pOH, [H⁺], [OH⁻], and the solution type.
- Click Reset to restore default example values.