Enter the hydrogen ion concentration or pH value into the calculator to determine the corresponding value.
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Mol/L To pH Formula
The following formula is used to calculate the pH from the hydrogen ion concentration in mol/L.
pH = -log_{10}[H^+]Variables:
- pH is the measure of acidity or alkalinity
- [H+] is the hydrogen ion concentration in mol/L
To calculate the pH, take the negative logarithm (base 10) of the hydrogen ion concentration.
| pH | [H+] (mol/L) | [H+] (mmol/L) | [H+] (µmol/L) |
|---|---|---|---|
| 0 | 1 | 1000 | 1000000 |
| 1 | 0.1 | 100 | 100000 |
| 2 | 0.01 | 10 | 10000 |
| 2.5 | 0.0031623 | 3.16228 | 3162.28 |
| 3 | 0.001 | 1 | 1000 |
| 3.5 | 0.000316228 | 0.316228 | 316.228 |
| 4 | 0.0001 | 0.1 | 100 |
| 5 | 0.00001 | 0.01 | 10 |
| 6 | 0.000001 | 0.001 | 1 |
| 6.5 | 3.16228e-7 | 0.000316228 | 0.316228 |
| 7 | 1e-7 | 0.0001 | 0.1 |
| 7.4 | 3.98107e-8 | 3.98107e-5 | 0.0398107 |
| 7.5 | 3.16228e-8 | 3.16228e-5 | 0.0316228 |
| 8 | 1e-8 | 0.00001 | 0.01 |
| 9 | 1e-9 | 0.000001 | 0.001 |
| 10 | 1e-10 | 0.0000001 | 0.0001 |
| 11 | 1e-11 | 1e-8 | 0.00001 |
| 12 | 1e-12 | 1e-9 | 0.000001 |
| 13 | 1e-13 | 1e-10 | 0.0000001 |
| 14 | 1e-14 | 1e-11 | 0.00000001 |
| Formula: [H+] (mol/L) = 10^-pH; pH = -log10([H+]). Unit relations: 1 mol/L = 1000 mmol/L = 1,000,000 µmol/L. | |||
What is pH?
pH is a scale used to specify the acidity or basicity of an aqueous solution. It is a measure of the hydrogen ion concentration in a solution. Solutions with a pH less than 7 are considered acidic, while those with a pH greater than 7 are considered basic (alkaline). A pH of 7 is neutral, indicating a balance between hydrogen ions (H+) and hydroxide ions (OH–). The pH scale is logarithmic, meaning each whole number change on the scale represents a tenfold change in hydrogen ion concentration.
How to Calculate pH?
The following steps outline how to calculate the pH from the hydrogen ion concentration.
- First, determine the hydrogen ion concentration in mol/L.
- Next, take the negative logarithm (base 10) of the hydrogen ion concentration.
- The result is the pH value of the solution.
- After inserting the values and calculating the result, check your answer with the calculator above.
Example Problem :
Use the following variables as an example problem to test your knowledge.
Hydrogen ion concentration (mol/L) = 1.0 x 10-3
pH = -log10(1.0 x 10-3) = 3