Molarity Calculator
Find molarity from solute mass, molar mass and volume, or the grams to weigh for a target mol/L. 5.844 g NaCl in 1 L gives 0.1 M.
Solutions and Concentration
5 tools
Which Solutions and Concentration tool do you need?
| Tool | What it answers |
|---|---|
| Molality Calculator | Molality is the moles of solute divided by the mass of solvent in kilograms, written mol/kg or m. |
| Molarity Calculator | Molarity is moles of solute per litre of finished solution: M = (mass ÷ molar mass) ÷ volume in litres. |
| pH Calculator | pH is the negative base-10 logarithm of the hydrogen ion concentration: pH = −log10[H+]. |
| pH to H+ | To turn pH into hydrogen ion concentration, raise 10 to the power of minus the pH: [H+] = 10^-pH mol/L. |
| pOH Calculator | pOH is the negative base-10 logarithm of the hydroxide ion concentration: pOH = −log10[OH⁻]. |
All tools
pH to H+
Convert pH to hydrogen ion concentration [H+] in mol/L using [H+] = 10^-pH, with pOH and hydroxide [OH-] at 25 °C. pH 3.5 gives 3.16 × 10^-4 M.
Molality Calculator
Find molality in mol/kg from solute mass and molar mass, or from moles, with the solvent in grams or kilograms. Shows moles and mass percent.
pOH Calculator
Find pOH from hydroxide concentration, hydrogen ion concentration or pH, with pH, both ion concentrations and the working using pKw = 14.
pH Calculator
Find pH and pOH from a strong or weak acid or base, or from [H+] or [OH-]. Weak acids use the exact Ka quadratic, e.g. 0.1 M acetic acid gives pH 2.88.