Acids and bases

Front

What is an acid?

Back

An acid is a substance that releases hydrogen ions (H⁺) in an aqueous solution and has a pH less than 7.

Front

What is the pOH of a 1 x 10⁻⁸ M solution of HNO₃?

Back

6

Front

What happens to red litmus paper when placed in a base?

Back

Red litmus paper turns blue when placed in a base.

Front

What is the pH range of human blood?

Back

The pH of human blood is between 7.35 and 7.45, which is slightly basic.

Front

What is the definition of a base?

Back

A base is a substance that accepts hydrogen ions (H⁺) or donates hydroxide ions (OH⁻) in an aqueous solution and has a pH greater than 7.

Front

What is the relationship between pH and pOH?

Back

pH + pOH = 14 at 25°C.

Front

What is a strong acid?

Back

A strong acid is an acid that completely dissociates in solution, releasing all of its hydrogen ions.

Front

What is a weak acid?

Back

A weak acid is an acid that partially dissociates in solution, releasing some but not all of its hydrogen ions.

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 pH of pure water at 25°C?

Back

The pH of pure water at 25°C is 7.