pH

Examples

**Example 1 ** Find the pH of apple juice with a hydrogen ion concentration of 3.2 x 10^{-4 }.

*Step 1.* Substitute 3.2 x 10^{-4 }in the formula.

*Step 2.* Use a calculator to solve.

Example 2 Find the hydrogen ion concentration of ketchup which has a pH of 3.9.

*Step 1.* Substitute 3.9 into the formula.

*Step 2.* Use the inverse operations of logs and exponents and a calculator to solve.