pH Calculator
Calculate the pH of a solution from its hydrogen ion concentration [H+].
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Calculation Parameters
Adjust the values below.
1.09.9
-140
Calculated Result
Calculated pH 7.00
Solution Type Neutral
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Expert Tip
Ensure units are correctly formatted (e.g. Kelvin for gas temperatures and liters for volumes) to get chemically accurate outputs.
How this Calculator Works
This calculator allows you to solve pH problems dynamically. Adjust the input parameters using the sliders or selection menu below:
- H+ Concentration - Coefficient (Range: 1.0 to 9.9, Default: 1.0)
- H+ Concentration - Exponent (10^x) (Range: -14 to 0, Default: -7)
The results are computed instantly and updated in the results panel on the right.
Formula & Methodology
pH = -log10([H+])
Where:
- H+ Concentration - Coefficient: Parameter value.
- H+ Concentration - Exponent: Parameter value.
Step-by-Step Calculation Example
To calculate pH manually, follow these steps:
- Identify the input parameters. For example:
- H+ Concentration - Coefficient = 1.0
- H+ Concentration - Exponent (10^x) = -7
- Apply the formula:
pH = -log10([H+])
- Verify the calculated value which is updated instantly in the results panel on the right.
Frequently Asked Questions
What is pH? ▼
pH is the negative decimal logarithm of hydrogen ion activity: pH = -log10([H+]).
What is the relationship between pH and pOH? ▼
At 25°C in aqueous solution, pH + pOH = 14.0.
How much does [H+] change per 1 pH unit? ▼
Because the pH scale is logarithmic, each 1.0 unit change represents a 10-fold change in hydrogen ion concentration.