Calculating pH and pOH

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 basicity of a solution, defined as the negative logarithm of the hydroxide ion concentration: pOH = -log[OH-].

Front

What is the relationship between pH and pOH?

Back

The sum of pH and pOH in a solution at 25°C is always 14: pH + pOH = 14.

Front

How do you calculate pH from hydrogen ion concentration?

Back

To calculate pH from [H+], use the formula: pH = -log[H+].

Front

How do you calculate pOH from hydroxide ion concentration?

Back

To calculate pOH from [OH-], use the formula: pOH = -log[OH-].

Front

If the pH of a solution is 5.6, what is the pOH?

Back

The pOH is 8.4 (since 14 - 5.6 = 8.4).

Front

If the [H+] of a solution is 6.8 x 10^-9 mol/L, what is the pH?

Back

The pH is 8.17 (calculated using pH = -log(6.8 x 10^-9)).

Front

If the [OH-] of a solution is 2.7 x 10^-4 mol/L, what is the pOH?

Back

The pOH is 3.56 (calculated using pOH = -log(2.7 x 10^-4)).

Front

What is the hydronium ion concentration of 4.0 M H2SO4?

Back

The hydronium ion concentration is 8.0 M (since H2SO4 is a strong acid and dissociates completely, contributing 2 H+ ions per molecule).

Front

What is the formula to convert pH to [H+]?

Back

To convert pH to [H+], use the formula: [H+] = 10^(-pH).