Acids and Bases

Front

What is an acid?

Back

An acid is a substance that donates protons (H+) in a solution and has a pH less than 7. Examples include lemon juice and vinegar.

Front

What is a base?

Back

A base is a substance that accepts protons (H+) or donates hydroxide ions (OH-) in a solution and has a pH greater than 7. Examples include soap and baking soda.

Front

What does pH measure?

Back

pH measures the acidity or basicity of a solution on a scale from 0 to 14, where 7 is neutral, below 7 is acidic, and above 7 is basic.

Front

What is litmus paper used for?

Back

Litmus paper is used to determine the relative pH of a substance. Blue litmus paper turns red in acidic solutions, while red litmus paper turns blue in basic solutions.

Front

What is a neutral substance?

Back

A neutral substance has a pH of 7, meaning it is neither acidic nor basic. An example is pure water.

Front

What happens to blue litmus paper in an acidic solution?

Back

Blue litmus paper turns red when placed in an acidic solution.

Front

What happens to red litmus paper in a basic solution?

Back

Red litmus paper turns blue when placed in a basic solution.

Front

Name a common household acid.

Back

Common household acids include vinegar and lemon juice.

Front

Name a common household base.

Back

Common household bases include baking soda and soap.

Front

What is the pH of lemon juice?

Back

Lemon juice typically has a pH of around 2, making it acidic.