11 mark
In a titration, the equivalence point is reached when 23.70 mL of 0.02 M potassium hydroxide reacts with 0.03 M of sulfuric acid. What volume of acid is needed?
7.9 mL
31.65 mL
15.80 mL
17.78 mL
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Acid-Base Titrations (College Board AP® Chemistry)
Exam Questions
33 mins8 questions
21 mark
Indicator | pKa |
Methyl orange | 3.7 |
Phenolphthalein | 9.6 |
Phenol red | 7.9 |
Bromothymol blue | 7.0 |
The pH range of four different indicators are given in the table. Which indicator would be suitable for a titration involving hydrochloric acid and ammonia?
Methyl orange
Phenolphthalein
Phenol red
Bromothymol blue
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31 mark
Which type of titration is indicated by the pH curve above?
Strong acid - strong base
Weak acid - weak base
Strong acid - weak base
Weak acid - strong base
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41 mark
The acid–base indicator bromophenol blue changes colour from yellow to blue over a pH range of 3.0–4.6. Which statement(s) is/are correct?
I. The pKa is between 3.0 and 4.6
II. In a neutral solution [HIn] > [In-]
III. It is a suitable indicator for a strong acid, weak base titration
I and II only
I and III only
II and III only
I, II and III
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51 mark
The pH curve above represents a weak acid, strong base titration. The pH of the acid at half equivalence point is 4.90.
What is the Ka of the acid?
4.90
8.72
1.26 x 10-5
1.91 x 10-9
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