Understanding pH
pH is a measure of the acidity or alkalinity of a solution. It's calculated using the following formula:
pH = -log[H+]
where:
* pH is the pH value
* log is the base-10 logarithm
* [H+] is the concentration of hydrogen ions in moles per liter (M)
Calculation
1. Substitute the hydrogen ion concentration:
pH = -log(7.0 x 10^-2)
2. Use a calculator to find the logarithm:
pH ≈ 1.15
Answer
The pH of a solution with a hydrogen ion concentration of 7.0 x 10^-2 M is approximately 1.15. This solution is acidic because its pH is less than 7.
