Syllabus Edition
First teaching 2023
First exams 2025
The following equilibrium is set up in a mixture of sulfuric acid and concentrated nitric acid.
H2SO4 + HNO3 ⇌ HSO4- + H2NO3+
Which row correctly describes the behaviour of each molecule within the equilibrium?
|
H2SO4 |
HNO3 |
HSO4– |
H2NO3+ |
|
|
A B C D |
Acid Base Acid Acid |
Acid Acid Base Base |
Base Acid Base Acid |
Base Base Acid Base |
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The table gives the concentrations and pH values of the aqueous solutions of two compounds, P and Q. Either compound could be an acid or a base.
|
P |
Q |
|
|
Concentration pH |
2 mol dm–3 9 |
2 mol dm–3 6 |
Student X concluded that Q is a strong acid.
Student Y concluded that the extent of dissociation is lower in Q (aq) than in P (aq).
Which of the students are correct?
X only
Y only
Both X and Y
Neither X nor Y
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The pH range of four different indicators are:
| Indicator | pH range for colour change |
| Methyl orange | 3.2 - 4.4 |
| Phenolphthalein | 8.2 - 10.0 |
| Thymol blue | 1.2 - 2.8 |
| Bromothymol blue | 6.0 - 7.6 |
Which indicator would be suitable for a titration involving hydrochloric acid and ammonia?
Methyl orange
Phenolphthalein
Thymol blue
Bromothymol blue
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The following reaction occurs between concentrated sulfuric and nitric acids.
H2SO4 + HNO3 ⇋ H2NO3+ + HSO4-
Identify the two species which are acting as Brønsted–Lowry bases.
H2NO3+ and HSO4-
HNO3 and H2NO3+
H2SO4 and HSO4-
HNO3 and HSO4-
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