Unlock essential acid-base chemistry calculations with our free online Acid Base Calculator. Easily find pH, pOH, hydrogen ion concentration ([H+]), or hydroxide ion concentration ([OH-]) using a single known value. Perfect for students, educators, and laboratory professionals needing quick, accurate results for aqueous solutions.
Formula:
The Acid Base Calculator utilizes fundamental chemical relationships at 25°C to determine pH, pOH, and ion concentrations. Here are the core formulas:
- pH: Measures hydrogen ion activity. pH = -log<sub>10</sub>[H<sup>+</sup>]
- pOH: Measures hydroxide ion activity. pOH = -log<sub>10</sub>[OH<sup>-</sup>]
- Relationship between pH and pOH: pH + pOH = 14
- Hydrogen Ion Concentration: [H<sup>+</sup>] = 10<sup>-pH</sup>
- Hydroxide Ion Concentration: [OH<sup>-</sup>] = 10<sup>-pOH</sup>
- Ion Product of Water (K<sub>w</sub>): [H<sup>+</sup>][OH<sup>-</sup>] = 1.0 × 10<sup>-14</sup>
These equations allow for the interconversion of pH, pOH, [H<sup>+</sup>], and [OH<sup>-</sup>] in aqueous solutions.