Acids, Bases and pH Scale

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 is an acid?

Back

An acid is a substance that donates hydrogen ions (H+) in a solution.

Front

What is a base?

Back

A base is a substance that accepts hydrogen ions (H+) or donates hydroxide ions (OH-) in a solution.

Front

What is the relationship between pH and hydrogen ion concentration?

Back

As pH decreases, hydrogen ion concentration increases; as pH increases, hydrogen ion concentration decreases.

Front

What is a Bronsted-Lowry acid?

Back

A Bronsted-Lowry acid is a substance that donates a proton (H+) to another substance.

Front

What is a Bronsted-Lowry base?

Back

A Bronsted-Lowry base is a substance that accepts a proton (H+) from another substance.

Front

What happens to pH when an acid is added to water?

Back

The pH of the solution decreases, indicating an increase in hydrogen ion concentration.

Front

What happens to pH when a base is added to water?

Back

The pH of the solution increases, indicating a decrease in hydrogen ion concentration.

Front

What is the pH of a neutral solution?

Back

The pH of a neutral solution is 7.

Front

How does the pH scale relate to the concentration of H+ ions?

Back

Each unit change in pH represents a tenfold change in hydrogen ion concentration.