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
Did this page help you?
Acid-Base Titrations (College Board AP® Chemistry)
Exam Questions
33 mins8 questions21 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
Did this page help you?
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
Did this page help you?
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
Did this page help you?
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
Did this page help you?