Here's a breakdown:

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

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

* Acidic: Substances with a pH lower than 7 are considered acidic.

* Alkaline (Basic): Substances with a pH higher than 7 are considered alkaline or basic.

Examples of alkaline substances:

* Household cleaners: Many cleaning products, like ammonia and bleach, are alkaline.

* Soaps: Many soaps are alkaline.

* Baking soda: This common household ingredient is alkaline.

* Antacids: These medications neutralize stomach acid, which is acidic.

* Seawater: The ocean is naturally alkaline.

* Lye: This chemical is extremely alkaline.

Important note: It's essential to be cautious when handling alkaline substances, as they can be corrosive and harmful to skin and eyes.