Enter the pH or the hydrogen ion concentration into the calculator to determine the missing value.
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pH to Mol/L Formula
The following formula is used to calculate the hydrogen ion concentration from pH.
[H⁺] = 10^{-pH}Variables:
- [H⁺] is the hydrogen ion concentration in moles per liter (Mol/L)
- pH is the measure of the acidity or basicity of an aqueous solution
To calculate the hydrogen ion concentration, use the formula above where the pH is the negative logarithm (base 10) of the hydrogen ion concentration.
| pH | [H+] (mol/L) | [H+] (mmol/L) | [H+] (µmol/L) |
|---|---|---|---|
| 0 | 1.00e+0 | 1.00e+3 | 1.00e+6 |
| 1 | 1.00e-1 | 1.00e+2 | 1.00e+5 |
| 1.5 | 3.16e-2 | 3.16e+1 | 3.16e+4 |
| 2 | 1.00e-2 | 1.00e+1 | 1.00e+4 |
| 2.5 | 3.16e-3 | 3.16e+0 | 3.16e+3 |
| 3 | 1.00e-3 | 1.00e+0 | 1.00e+3 |
| 3.5 | 3.16e-4 | 3.16e-1 | 3.16e+2 |
| 4 | 1.00e-4 | 1.00e-1 | 1.00e+2 |
| 5 | 1.00e-5 | 1.00e-2 | 1.00e+1 |
| 6 | 1.00e-6 | 1.00e-3 | 1.00e+0 |
| 6.5 | 3.16e-7 | 3.16e-4 | 3.16e-1 |
| 7 | 1.00e-7 | 1.00e-4 | 1.00e-1 |
| 7.4 | 3.98e-8 | 3.98e-5 | 3.98e-2 |
| 8 | 1.00e-8 | 1.00e-5 | 1.00e-2 |
| 9 | 1.00e-9 | 1.00e-6 | 1.00e-3 |
| 10 | 1.00e-10 | 1.00e-7 | 1.00e-4 |
| 11 | 1.00e-11 | 1.00e-8 | 1.00e-5 |
| 12 | 1.00e-12 | 1.00e-9 | 1.00e-6 |
| 13 | 1.00e-13 | 1.00e-10 | 1.00e-7 |
| 14 | 1.00e-14 | 1.00e-11 | 1.00e-8 |
| [H+] is the hydrogen ion concentration. Relation: [H+] (mol/L) = 10^(-pH). 1 mmol/L = 1e-3 mol/L; 1 µmol/L = 1e-6 mol/L. | |||
What is pH?
pH is a scale used to specify the acidity or basicity of an aqueous solution. It is approximately the negative of the base 10 logarithm of the molar concentration, measured in units of moles per liter, of hydrogen ions. Solutions with a pH less than 7 are acidic, and solutions with a pH greater than 7 are basic or alkaline. The pH scale is logarithmic and therefore each whole pH value below 7 is ten times more acidic than the next higher value. For example, a pH of 4 is ten times more acidic than a pH of 5 and 100 times (10 times 10) more acidic than a pH of 6.
How to Calculate Hydrogen Ion Concentration?
The following steps outline how to calculate the hydrogen ion concentration from pH.
- First, determine the pH of the solution.
- Next, use the formula [H⁺] = 10^{-pH} to calculate the hydrogen ion concentration.
- Finally, insert the values and calculate the result.
- Check your answer with the calculator above.
Example Problem :
Use the following variables as an example problem to test your knowledge.
pH = 3
Hydrogen Ion Concentration (Mol/L) = 10^{-3} = 0.001 Mol/L