Enter the pH value into the calculator to determine the hydronium ion concentration. This calculator can also evaluate the pH given the hydronium ion concentration is known.

Hydronium Ion Concentration Formula

The following formula is used to calculate the hydronium ion concentration.

[H3O+] = 10^-pH


  • [H3O+] is the hydronium ion concentration (M) pH is the measure of acidity or alkalinity of a solution

To calculate the hydronium ion concentration, raise 10 to the power of the negative pH value. The result is the hydronium ion concentration in moles per liter (M).

What is a Hydronium Ion Concentration?

Hydronium ion concentration refers to the amount of hydronium ions (H3O+) present in a solution. It is a crucial concept in chemistry, particularly in acid-base chemistry, as it is used to measure the acidity or alkalinity of a solution. The higher the concentration of hydronium ions, the more acidic the solution is, and vice versa. It is typically expressed in terms of pH, where pH is the negative logarithm of the hydronium ion concentration.

How to Calculate Hydronium Ion Concentration?

The following steps outline how to calculate the Hydronium Ion Concentration using the formula [H3O+] = 10^-pH.

  1. First, determine the pH value of the solution.
  2. Next, take the negative exponent of the pH value. This can be done by raising 10 to the power of the negative pH value.
  3. Finally, calculate the hydronium ion concentration by multiplying the result from step 2 by 10.

Example Problem:

Use the following variables as an example problem to test your knowledge.

pH = 3