Here's why:

* The pH scale: The pH scale measures the acidity or alkalinity of a solution. It ranges from 0 to 14.

* Acidic solutions: Solutions with a pH less than 7 are considered acidic. The lower the pH, the stronger the acid.

* Neutral solutions: A pH of 7 is considered neutral. Pure water has a pH of 7.

* Alkaline (basic) solutions: Solutions with a pH greater than 7 are considered alkaline or basic.

Examples of substances with a pH of 3:

* Lemon juice

* Vinegar

* Orange juice

* Some types of soda