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.

Front

What is a base?

Back

A base is a substance that accepts protons (H+) or produces hydroxide ions (OH-) in a solution and has a pH greater than 7.

Front

What is the pH scale?

Back

The pH scale measures the acidity or basicity of a solution, ranging from 0 (very acidic) to 14 (very basic), with 7 being neutral.

Front

What happens to blue litmus paper in an acid?

Back

Blue litmus paper turns red when it comes into contact with an acid.

Front

What happens to red litmus paper in a base?

Back

Red litmus paper turns blue when it comes into contact with a base.

Front

What is a neutral substance?

Back

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

Front

What is the strongest acid on the pH scale?

Back

The strongest acid has a pH close to 0.

Front

What is the weakest base on the pH scale?

Back

The weakest base has a pH just above 7, such as a pH of 8.

Front

What is the relationship between pH and hydrogen ion concentration?

Back

As pH decreases, hydrogen ion concentration increases, indicating a more acidic solution.

Front

What is a common example of a strong acid?

Back

Hydrochloric acid (HCl) is a common example of a strong acid.