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pH Calculator: Calculate Acidity & Alkalinity

Calculate pH from Hydrogen ion concentration [H+].

What is pH?

pH is a measure of the acidity or alkalinity of a solution. The scale typically runs from 0 (very acidic) to 14 (very alkaline), with 7 being neutral (like pure water).

The pH Formula

  1. Formula: pH = -log[H+]
  2. This means pH is the negative logarithm (base 10) of the hydrogen ion concentration.
  3. Example: If [H+] = 0.001 M (which is 10^-3), then pH = 3.

Chemistry FAQs

What is pOH?

pOH measures the concentration of Hydroxide ions [OH-]. The relationship is always: pH + pOH = 14.