pH to OH- Concentration Calculator

Calculate OH- Concentration from pH

Formula

To calculate the hydroxide ion (OH-) concentration from the pH value:

\[ [\text{OH}^-] = 10^{-14 + \text{pH}} \]

Where:

What is OH- Concentration?

OH- concentration is a measure of the amount of hydroxide ions present in a solution. It is an important parameter in chemistry, particularly in the context of acid-base reactions and pH. The concentration of OH- ions in a solution determines its basicity and is inversely related to the concentration of hydrogen ions (H+), which determines acidity.

Example Calculation 1

Let's assume the following value:

Using the formula:

\[ [\text{OH}^-] = 10^{-14 + 7} = 10^{-7} \approx 0.0000001 \, \text{mol/L} \]

The OH- Concentration is approximately 0.0000001 mol/L.

Example Calculation 2

Let's assume the following value:

Using the formula:

\[ [\text{OH}^-] = 10^{-14 + 9} = 10^{-5} \approx 0.00001 \, \text{mol/L} \]

The OH- Concentration is approximately 0.00001 mol/L.