Question

The pH scale is a measure of ions concentration in a solution.

• A. hydrogen
• B. hydroxide
• C. oxygen

Answer 1

The correct option is A hydrogen

The pH scale measures the concentration of ${\text{H}}^{+}$ ions.
The scale ranges from 0-14 at $25{}^{\circ }\text{C}$ and is used to specify how acidic or basic a solution is.
At $25{}^{\circ }\text{C}$:
- Solutions with a pH < 7 are acidic
- Solutions with a pH > 7 are basic
- Solution with a pH = 7 are neutral.