Biology defines acids as substances that donate protons and bases as those that accept protons. It notes that litmus paper turning from red to blue indicates a solution changing from acidic to basic. The document also introduces the pH scale, explaining that solutions with a pH greater than 7 are basic, equal to 7 are neutral, and less than 7 are acidic.

1. Biology
Summary
★ The difference between an acid and a base, is a base accepts a proton which
an acid donates.
★ When litmus turned from red to blue it indicates a change in solution from an
acid to a base
★ The ph scale lets you see the level of acidity
★
pH Solution
pH>7 Basic
pH=7 Neutral
pH<7 acidic
By: Juana Perez Muñiz