pH scale and indicators

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 pH value indicates a strong acid?

Back

A strong acid has a pH value close to 0, typically around 1.

Front

What pH value indicates a strong alkali?

Back

A strong alkali has a pH value close to 14.

Front

What pH value is considered neutral?

Back

A neutral pH value is 7.

Front

What ion do all alkalis contain?

Back

All alkalis contain hydroxide ions (OH⁻).

Front

What ion do all acids release in solution?

Back

All acids release hydrogen ions (H⁺) in solution.

Front

What is a weak acid?

Back

A weak acid is an acid that does not completely dissociate in solution, typically having a pH value above 1 but below 7, such as acetic acid.

Front

What is a strong acid?

Back

A strong acid is an acid that completely dissociates in solution, resulting in a low pH, typically around 1.

Front

What is a weak alkali?

Back

A weak alkali is a base that does not completely dissociate in solution, typically having a pH value above 7 but below 14.

Front

What is the significance of pH 7 in the pH scale?

Back

pH 7 is significant because it represents a neutral solution, where the concentration of hydrogen ions equals the concentration of hydroxide ions.