pH calculations

Front

What is pH?

Back

pH is a measure of the acidity or basicity of a solution, defined as the negative logarithm (base 10) of the hydronium ion concentration: pH = -log[H₃O⁺].

Front

What is the relationship between pH and [H₃O⁺]?

Back

As pH decreases, the concentration of hydronium ions [H₃O⁺] increases, indicating a more acidic solution. Conversely, as pH increases, [H₃O⁺] decreases, indicating a more basic solution.

Front

How do you calculate [H₃O⁺] from pH?

Back

To find [H₃O⁺] from pH, use the formula: [H₃O⁺] = 10^(-pH).

Front

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

Back

The pH of a neutral solution at 25°C is 7.0.

Front

What is the pH of a solution with [H₃O⁺] = 1 x 10⁻⁷ M?

Back

The pH of a solution with [H₃O⁺] = 1 x 10⁻⁷ M is 7.0, indicating neutrality.

Front

If the pH of a solution is 3, what is the [H₃O⁺] concentration?

Back

If the pH is 3, then [H₃O⁺] = 10^(-3) M = 0.001 M.

Front

What is the pH of a solution with [H₃O⁺] = 2.5 x 10⁻⁵ M?

Back

The pH is calculated as pH = -log(2.5 x 10⁻⁵) = 4.60.

Front

How do you convert pH to [H₃O⁺] concentration?

Back

Use the formula: [H₃O⁺] = 10^(-pH).

Front

What is the pH of a solution with [H₃O⁺] = 4.0 x 10⁻⁷ M?

Back

The pH is calculated as pH = -log(4.0 x 10⁻⁷) = 6.40.

Front

If the pH of a solution is 5.75, what is the [H₃O⁺] concentration?

Back

The [H₃O⁺] concentration is 10^(-5.75) M.