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

18. Aqueous Equilibrium

Acid-Base Indicators

General Chemistry

18. Aqueous Equilibrium

Acid-Base Indicators

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Multiple Choice

Which of the following indicators is most suitable for use in the titration of hypobromous acid (HBrO, pKa=8.7) with a strong base?

Bromothymol blue (pH range: 6.0-7.6)

Methyl orange (pH range: 3.1-4.4)

Phenolphthalein (pH range: 8.2-10.0)

Litmus (pH range: 4.5-8.3)

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Verified step by step guidance

Identify the type of titration: This is a weak acid (hypobromous acid) being titrated with a strong base.

Determine the pH at the equivalence point: For a weak acid-strong base titration, the pH at the equivalence point is greater than 7. The pH can be estimated using the formula: \( \text{pH} = \frac{1}{2} (\text{pKa} + \text{pKw}) \), where \( \text{pKw} = 14 \).

Calculate the approximate pH at the equivalence point: Substitute the given \( \text{pKa} = 8.7 \) into the formula to find the pH at the equivalence point.

Select an appropriate indicator: The indicator should change color at a pH close to the equivalence point. Compare the pH ranges of the given indicators to the calculated pH.

Choose the indicator with a pH range that includes the equivalence point pH: Phenolphthalein, with a pH range of 8.2-10.0, is suitable as it encompasses the calculated equivalence point pH.