pH and pOH Calculations

Front

What is pH?

Back

pH is a measure of the acidity or basicity of a solution, defined as the negative logarithm of the hydrogen ion concentration: pH = -log[H⁺].

Front

What is pOH?

Back

pOH is a measure of the hydroxide ion concentration in a solution, defined as pOH = -log[OH⁻].

Front

What is the relationship between pH and pOH?

Back

pH + pOH = 14 at 25°C.

Front

What does a pH less than 7 indicate?

Back

A pH less than 7 indicates that the solution is acidic.

Front

What does a pH greater than 7 indicate?

Back

A pH greater than 7 indicates that the solution is basic.

Front

What is the pH of a neutral solution at 25°C?

Back

The pH of a neutral solution at 25°C is 7.

Front

What is the formula to calculate [H⁺] from pH?

Back

[H⁺] = 10^(-pH).

Front

What is the formula to calculate [OH⁻] from pOH?

Back

[OH⁻] = 10^(-pOH).

Front

If a solution has a pH of 3, what is its [H⁺] concentration?

Back

[H⁺] = 1.0 x 10^(-3) M.

Front

If a solution has a pOH of 5, what is its [OH⁻] concentration?

Back

[OH⁻] = 1.0 x 10^(-5) M.