The pH Scale Practice Problems

Under normal conditions, how can the pH of a solution be calculated given the [OH⁻] in the solution?

Explain why adding a base to pure water causes the concentration of hydronium ions (H₃O⁺) to decrease.

Explain why the pH of a neutral solution is 7.0.

Classify a detergent (pH = 8.3) as acidic, basic, or neutral.

Compare the concentrations of H₃O⁺ and OH⁻ in an acidic solution.

Rio Tinto is a highly acidic river in southwestern Spain. This river has an average pH of 2.00. What are the [H₃O⁺] and the [OH⁻] of the river?

Determine the [H₃O⁺] of a solution of Rochelle salt (potassium sodium tartrate) if its [OH⁻] is 3.2×10⁻⁷ M.

Find the [H₃O⁺] of the human aqueous humor if its [OH⁻] is 2.2×10⁻⁷ M.

The choroid plexus produces the cerebrospinal fluid, which contains 5.0×10⁻⁸ M H₃O⁺ ions. Determine the pH of the cerebrospinal fluid.

Which of the following solutions is more acidic: solution Y with a pH of 8.3 or solution Z with a pH of 6.7?

Identify which of the following solutions is more acidic: solution X with a pH of 4.5 or solution Y with a pH of 5.5.

Determine the pH of a solution if the hydronium ions (H₃O⁺) present in the solution have a concentration of 0.0005 M.

Provide the pH of a solution if the concentration of OH⁻ ions in the solution is 6.7×10⁻⁷ M.

Give the pH of a solution if the concentration of OH⁻ ions in the solution is 5.33×10⁻⁴ M.

Provide the missing data for bleach in the following table:

Calculate the missing data in the following:

True or False: The reaction between H⁺ and OH^– yields an H₃O⁺ ion.

The blood plasma pH of a patient is 8.67. Calculate its [H₃O⁺] and express with two significant figures. 

At 25°C, An aqueous solution in a beaker has [OH^-] = 8.97x 10^-2M. Which statement about the solution is true?

I. The solution has [H₃O⁺] = 1.11x10^-13 M

II. The solution has a pH of 1.05

III. The solution is basic.

We are given three solutions

Solution A: [OH^-] = 2.43 × 10^–7 M 

Solution B: [H₃O⁺] = 7.79 × 10^–9 M 

Solution C: [OH^-] = 0.000349 M

a. What is the [H₃O⁺] for solution A?

b. What is the [OH^-] for solution B?

c. What is the [H₃O⁺] for solution C?

d. Which of the three solutions is the most basic?

Compare the concentration of hydronium ions compared to the concentration of hydroxide ions in an acidic solution.