Hydrogen Ion Concentration Calculator

Your details

Choose the known quantity. The calculator derives all other values.
The pH of the solution (0-14 for most practical solutions, 7 is neutral at 25 C).
Water temperature affects Kw. At 25 C, pH + pOH = 14. At other temperatures, the neutral point shifts. Leave at 25 C for standard results.
C
pHAcidic
3.5

Negative base-10 logarithm of the hydrogen ion concentration

pOH10.4947
[H+] concentration3.162 x 10^-4 mol/L
[OH-] concentration3.201 x 10^-11 mol/L
Kw at this temperature1.01 x 10^-14 mol/L
Neutral pH at this temperature6.997
pH + pOH13.9947
Solution typeAcidic
3.5
Strong Acid<3Weak Acid3-6Neutral6-8Weak Base8-11Strong Base11+

pH 3.5000 - Acidic solution

  • The hydrogen ion concentration is 3.162 x 10^-4 mol/L.
  • The hydroxide ion concentration is 3.201 x 10^-11 mol/L, and the pOH is 10.4947.
  • This solution is 3e+3 times more acidic than pure water at 25 C (pH 7).

Next stepFor buffer calculations, you can pair this result with the Henderson-Hasselbalch equation using the pKa of your weak acid.

 = Powered by OnlyCalculators