pH and pOH Calculations Practice

Front

What is pH?

Back

pH is a measure of the hydrogen ion concentration in a solution, indicating its acidity or basicity. It is calculated as pH = -log[H₃O⁺].

Front

What is pOH?

Back

pOH is a measure of the hydroxide ion concentration in a solution, indicating its basicity. It is calculated as pOH = -log[OH^-].

Front

What is the relationship between pH and pOH?

Back

pH + pOH = 14 at 25°C. This relationship shows that as the acidity of a solution increases (lower pH), its basicity decreases (higher pOH), and vice versa.

Front

How do you calculate [H₃O⁺] from pH?

Back

[H₃O⁺] = 10^-pH. For example, if pH = 8, then [H₃O⁺] = 10^-8 M.

Front

How do you calculate [OH^-] from pOH?

Back

[OH^-] = 10^-pOH. For example, if pOH = 3, then [OH^-] = 10^-3 M.

Front

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

Back

The pH of a neutral solution at 25°C is 7, indicating equal concentrations of H₃O⁺ and OH^-.

Front

If [H₃O⁺] = 1 x 10^-3 M, what is the pH?

Back

pH = -log(1 x 10^-3) = 3.

Front

If a solution has a pOH of 3.7, what is the [OH^-] concentration?

Back

[OH^-] = 10^-3.7 = 2.0 x 10^-4 M.

Front

What is the pH of a solution with [H₃O⁺] = 3.7 x 10^-9 M?

Back

pH = -log(3.7 x 10^-9) = 8.43.

Front

How do you find [H⁺] from [OH^-] concentration?

Back

Use the relationship: [H⁺] = 10^-14 / [OH^-].