Table of contents

1. Intro to General Chemistry3h 48m
2. Atoms & Elements4h 16m
3. Chemical Reactions4h 10m
4. BONUS: Lab Techniques and Procedures1h 38m
5. BONUS: Mathematical Operations and Functions48m
6. Chemical Quantities & Aqueous Reactions3h 53m
7. Gases3h 49m
8. Thermochemistry2h 37m
9. Quantum Mechanics2h 58m
10. Periodic Properties of the Elements3h 9m
11. Bonding & Molecular Structure3h 29m
12. Molecular Shapes & Valence Bond Theory1h 57m
13. Liquids, Solids & Intermolecular Forces2h 23m
14. Solutions3h 1m
15. Chemical Kinetics2h 53m
16. Chemical Equilibrium2h 29m
17. Acid and Base Equilibrium5h 1m
18. Aqueous Equilibrium4h 47m
19. Chemical Thermodynamics1h 50m
20. Electrochemistry2h 42m
21. Nuclear Chemistry2h 36m
22. Organic Chemistry5h 7m
23. Chemistry of the Nonmetals2h 39m
24. Transition Metals and Coordination Compounds3h 16m

17. Acid and Base Equilibrium

pH of Strong Acids and Bases

General Chemistry

17. Acid and Base Equilibrium

pH of Strong Acids and Bases

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Multiple Choice

Which of the following statements is true regarding the pH of strong bases KOH and Ca(OH)2 given their respective pH values of 11.89 and 11.68?

The pH values indicate that both solutions are neutral.

Ca(OH)2 has a higher concentration than KOH.

KOH has a higher concentration than Ca(OH)2.

Both KOH and Ca(OH)2 have the same concentration.

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Verified step by step guidance

Understand that pH is a measure of the hydrogen ion concentration in a solution. The lower the pH, the higher the concentration of hydrogen ions, and vice versa.

Recognize that strong bases like KOH and Ca(OH)2 dissociate completely in water, releasing hydroxide ions (OH⁻). The pH of a solution is related to the concentration of these hydroxide ions.

Recall that the pH scale ranges from 0 to 14, where a pH of 7 is neutral, below 7 is acidic, and above 7 is basic. Therefore, a pH of 11.89 and 11.68 indicates basic solutions, not neutral.

Compare the pH values: KOH has a pH of 11.89, which is higher than the pH of 11.68 for Ca(OH)2. A higher pH indicates a lower concentration of hydrogen ions and a higher concentration of hydroxide ions.

Conclude that since KOH has a higher pH than Ca(OH)2, it must have a higher concentration of hydroxide ions, meaning KOH has a higher concentration than Ca(OH)2.