Calculate the pH of Solutions
What is Calculate the pH of Solutions and Why it Matters
Calculating the pH of solutions is crucial in chemistry, biology, and environmental science. pH is a measure of the acidity or basicity of an aqueous solution. This calculator helps you determine the pH of solutions with given concentrations of hydronium ions (H+) and other ions.
How to Use This Calculator
- Enter the concentration of hydronium ions (H+) in mol/L.
- Enter the concentration of other ions (C) in mol/L.
- Click ‘Calculate’.
Formula & Methodology
The pH of a solution is calculated using the formula:
pH = -log10[H+]
Where [H+] is the concentration of hydronium ions in mol/L.
Real-World Examples
Example 1: Battery Acid
Battery acid has a concentration of H+ ions of 1.0 mol/L. What is its pH?
pH = -log10[1.0] = 0
Example 2: Rainwater
Rainwater has a concentration of H+ ions of 5.6 x 10-6 mol/L. What is its pH?
pH = -log10[5.6 x 10-6] = 5.25
Example 3: Blood
Blood has a concentration of H+ ions of 4.0 x 10-7.4 mol/L. What is its pH?
pH = -log10[4.0 x 10-7.4] = 7.4
Data & Statistics
| Substance | pH |
|---|---|
| Acetic Acid (1 M) | 2.9 |
| Baking Soda (0.1 M) | 8.3 |
| pH | Acidity/Basicity |
|---|---|
| < 7 | Acidic |
| > 7 | Basic |
| 7 | Neutral |
Expert Tips
- pH is a logarithmic scale, so each whole number change represents a tenfold change in acidity.
- Pure water has a pH of 7 at 25°C.
- pH can be measured using a pH meter or pH paper.
Interactive FAQ
What is the pH scale?
The pH scale is a measure of the acidity or basicity of an aqueous solution. It ranges from 0 (most acidic) to 14 (most basic), with 7 being neutral.
How does temperature affect pH?
Temperature can affect pH, but the change is small. For every 1°C change in temperature, the pH changes by about 0.003 units.