a solution in which [H_3O^+] > [OH^−]

a solution in which [H_3O^+] < [OH^−]

describes a solution in which [H_3O^+] = [OH^−]

logarithmic measure of the concentration of hydronium ions in a solution

logarithmic measure of the concentration of hydroxide ions in a solution

Chemistry 2e · 14.2 pH and pOH

pH and pOH: practice problems

6 problems from the book, with its answers. Check your working, or have any of them explained to you on the whiteboard.

Exercises 15
Explain why a sample of pure water at 40 °C is neutral even though [H₃O⁺] = 1.7 $\times$ 10⁻⁷ M. K $_{w}$ is 2.9 $\times$ 10⁻¹⁴ at 40 °C.
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Exercises 17
The ionization constant for water (K $_{w}$ ) is 9.311 $\times$ 10⁻¹⁴ at 60 °C. Calculate [H₃O⁺], [OH⁻], pH, and pOH for pure water at 60 °C.
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Exercises 19
Calculate the pH and the pOH of each of the following solutions at 25 °C for which the substances ionize completely:
(a) 0.000259 M HClO₄
(b) 0.21 M NaOH
(c) 0.000071 M Ba(OH)₂
(d) 2.5 M KOH
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Exercises 21
What are the hydronium and hydroxide ion concentrations in a solution whose pH is 6.52?
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Exercises 23
Calculate the hydronium ion concentration and the hydroxide ion concentration in lime juice from its pH. See Figure 14.2 for useful information.
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Exercises 25
The hydroxide ion concentration in household ammonia is 3.2 $\times$ 10⁻³ M at 25 °C. What is the concentration of hydronium ions in the solution?
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Key terms · 5

acidic: a solution in which [H_3O^+] > [OH^−]
basic: a solution in which [H_3O^+] < [OH^−]
neutral: describes a solution in which [H_3O^+] = [OH^−]
pH: logarithmic measure of the concentration of hydronium ions in a solution
pOH: logarithmic measure of the concentration of hydroxide ions in a solution

The tutor teaches the whole section, drawing it out step by step and answering your questions as you go.

pH and pOH: practice problems

6 problems from the book, with its answers. Check your working, or have any of them explained to you on the whiteboard.

Exercises 15

Explain why a sample of pure water at 40 °C is neutral even though [H₃O⁺] = 1.7 $\times$ 10⁻⁷ M. K $_{w}$ is 2.9 $\times$ 10⁻¹⁴ at 40 °C.

Exercises 17

The ionization constant for water (K $_{w}$ ) is 9.311 $\times$ 10⁻¹⁴ at 60 °C. Calculate [H₃O⁺], [OH⁻], pH, and pOH for pure water at 60 °C.

Exercises 19

Calculate the pH and the pOH of each of the following solutions at 25 °C for which the substances ionize completely:

(a) 0.000259 M HClO₄

(b) 0.21 M NaOH

(d) 2.5 M KOH

Exercises 21

What are the hydronium and hydroxide ion concentrations in a solution whose pH is 6.52?

Exercises 23

Calculate the hydronium ion concentration and the hydroxide ion concentration in lime juice from its pH. See Figure 14.2 for useful information.

Exercises 25

The hydroxide ion concentration in household ammonia is 3.2 $\times$ 10⁻³ M at 25 °C. What is the concentration of hydronium ions in the solution?

acidic: a solution in which [H_3O^+] > [OH^−]
basic: a solution in which [H_3O^+] < [OH^−]
neutral: describes a solution in which [H_3O^+] = [OH^−]
pH: logarithmic measure of the concentration of hydronium ions in a solution
pOH: logarithmic measure of the concentration of hydroxide ions in a solution

The tutor teaches the whole section, drawing it out step by step and answering your questions as you go.