pH Calculator

Calculate Solution pH and Ion Concentrations

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pH from [H⁺] Calculator

Calculate pH from hydrogen ion concentration.

pH: -

[H⁺] from pH Calculator

Calculate hydrogen ion concentration from pH.

[H⁺]: - mol/L

pH from Ka Calculator

Calculate pH of a weak acid solution using Ka.

Results will appear here

Understanding pH

What is pH?

pH is the negative logarithm (base 10) of the hydrogen ion concentration [H⁺]. The formula is:

pH = -log₁₀[H⁺]

[H⁺] = 10⁻ᵖᴴ

pH Scale

The pH scale ranges from 0 to 14:

  • pH < 7: Acidic
  • pH = 7: Neutral
  • pH > 7: Basic
  • Each unit = 10× change

Applications

pH is important in:

  • Chemical processes
  • Biological systems
  • Environmental monitoring
  • Quality control

Common Solutions

Typical pH values:

  • Blood: ~7.4
  • Pure water: 7.0
  • Coffee: ~5.0
  • Lemon juice: ~2.0