pH scale

Front

What is the pH scale?

Back

The pH scale is a measure of how acidic or basic a solution is, ranging from 0 (very acidic) to 14 (very basic), with 7 being neutral.

Front

What is a base?

Back

A base is a substance with a pH greater than 7 that can accept hydrogen ions (H+) or donate electron pairs.

Front

What is an acid?

Back

An acid is a substance with a pH less than 7 that can donate hydrogen ions (H+) in a solution.

Front

What does a pH of 7 indicate?

Back

A pH of 7 indicates a neutral solution, meaning it is neither acidic nor basic.

Front

What is the relationship between pH and hydrogen ion concentration?

Back

pH is the negative logarithm of the hydrogen ion concentration; as the concentration of H+ increases, pH decreases.

Front

What is a buffer?

Back

A buffer is a solution that resists changes in pH when small amounts of acid or base are added.

Front

What is the weakest acid among the following: bananas (pH 5), tomatoes (pH 4), cheese (pH 6), orange juice (pH 3)?

Back

Cheese (pH 6) is the weakest acid.

Front

What happens to pH when an acid is added to a solution?

Back

The pH of the solution decreases, indicating an increase in acidity.

Front

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

Back

The pH of the solution increases, indicating an increase in basicity.

Front

What is the pH of pure water?

Back

The pH of pure water is 7, which is considered neutral.