05 Acids, Bases and Salts, Set A To print: Ctrl + P, paper A4, margins Default.
Learners' AlleyDesigned by Khow Willard
05

Acids, Bases and Salts

Set AConcept Practice
Name
Time 50 minutes
Total 42 marks
A

From the lesson

25 marks
1

Which statement about 0.10 mol dm−3 hydrochloric acid and 0.10 mol dm−3 ethanoic acid is correct?

AThey have the same pH.
BHydrochloric acid has the higher concentration of H+ ions.
CEthanoic acid is the more concentrated acid.
DBoth acids are fully ionised.
Answer [1]

Learners' Alley, Acids, Bases and Salts slides

2

Which oxide reacts with both dilute hydrochloric acid and aqueous sodium hydroxide?

Acopper(II) oxide
Bcarbon dioxide
Caluminium oxide
Dcarbon monoxide
Answer [1]

Learners' Alley, Acids, Bases and Salts slides

3

What is the conjugate base of HSO4−?

AH2SO4
BSO42−
CH3O+
DOH−
Answer [1]

Learners' Alley, Acids, Bases and Salts slides

4

Which pair of substances could be mixed to make barium sulfate by precipitation?

ABa(NO3)2(aq) and Na2SO4(aq)
BBaCO3(s) and Na2SO4(aq)
CBaCl2(aq) and NaNO3(aq)
DBa(NO3)2(aq) and NaCl(aq)
Answer [1]

Learners' Alley, Acids, Bases and Salts slides

5

25.0 cm3 of aqueous sodium hydroxide is neutralised by 20.0 cm3 of 0.100 mol dm−3 sulfuric acid. What is the concentration of the sodium hydroxide?

A0.0400 mol dm−3
B0.0800 mol dm−3
C0.160 mol dm−3
D0.200 mol dm−3
Answer [1]

Learners' Alley, Acids, Bases and Salts slides

6
(a)
Name the salt and the gas formed when zinc reacts with dilute hydrochloric acid.
[1]
(b)
Why does solid citric acid not conduct electricity, while its solution in water does?
[1]

Learners' Alley, Acids, Bases and Salts slides

7
Write the balanced equation, with state symbols, for magnesium hydroxide reacting with hydrochloric acid.
[1]

Learners' Alley, Acids, Bases and Salts slides

8
Is every base an alkali? Explain.
[1]

Learners' Alley, Acids, Bases and Salts slides

9
(a)
Solution P has pH 2 and solution Q has pH 5. How many times greater is the concentration of H+ in P?
[1]
(b)
What colour is methyl orange in a solution of pH 9?
[1]

Learners' Alley, Acids, Bases and Salts slides

10
(a)
Give the conjugate base of H2SO4.
[1]
(b)
Give the conjugate acid of NH3.
[1]

Learners' Alley, Acids, Bases and Salts slides

11

In HCl(g) + NH3(g) → NH4Cl(s):

(a)
which reactant is the Brønsted–Lowry acid?
[1]
(b)
why is this not an acid–base reaction in the Arrhenius sense?
[1]

Learners' Alley, Acids, Bases and Salts slides

12

Suggest starting materials and a method to make each salt.

(a)
copper(II) sulfate
[1]
(b)
potassium nitrate
[1]
(c)
silver chloride
[1]

Learners' Alley, Acids, Bases and Salts slides

13
25.0 cm3 of aqueous sodium hydroxide is neutralised by 15.00 cm3 of 0.250 mol dm−3 hydrochloric acid. Find the concentration of the sodium hydroxide.
[2]

Learners' Alley, Acids, Bases and Salts slides

14
Which indicator would you use to titrate aqueous ammonia with hydrochloric acid? Explain.
[2]

Learners' Alley, Acids, Bases and Salts slides

15
2.50 g of impure CaCO3 is added to 50.0 cm3 of 1.00 mol dm−3 HCl (excess). The leftover acid needs 20.0 cm3 of 0.500 mol dm−3 NaOH. Find the percentage of CaCO3 in the sample (Mr 100.1).
[3]

Learners' Alley, Acids, Bases and Salts slides

B

Practice

17 marks
16

Which statement about acids and bases is correct?

AAll strong acids react with carbonates but all weak acids do not.
BThe oxides of Group 1 metals are amphoteric.
CThe pH of 1.0 mol/dm3 ethanoic acid, CH3COOH, is higher than the pH of 1.0 mol/dm3 sulfuric acid, H2SO4.
DThe pH of 1.0 mol/dm3 nitric acid, HNO3, is lower than the pH of 1.0 mol/dm3 hydrochloric acid, HCl.
Answer [1]

2024 Woodlands O Prelim P1 Q12

17

The table contains data about two acids.

acidconcentration / mol/dm3pH
hydrochloric acid0.11.0
ethanoic acid0.13.7

Which statement best explains the difference in pH values?

AEthanoic acid contains carbon, hydrogen and oxygen.
BEthanoic acid has larger molecules.
CHydrochloric acid partially ionises.
DHydrochloric acid releases more H+ ions in water.
Answer [1]

2024 BGSS O Prelim P2 Q15

18

Samples of HCl(aq) and HNO3(aq) are tested using Universal Indicator. The sample of HCl(aq) has a pH of 4 and the sample of HNO3(aq) has a pH of 2. Which statement explains why the samples have different pH values?

AHCl(aq) is a weak acid and HNO3(aq) is a strong acid.
BHNO3(aq) has a higher relative molecular mass than HCl(aq).
CThe sample of HCl(aq) has ionised more than the sample of HNO3(aq).
DThe sample of HNO3(aq) is more concentrated than the sample of HCl(aq).
Answer [1]

2024 CHS O Prelim P1 Q21

19

The pH of four solutions of the same concentration is measured using a pH meter.

solutionhydrochloric acidsulfuric acidethanoic acidsodium hydroxide
pHWXYZ

Which shows the correct order of the pH values?

AX < W < Y < Z
BY < X < W < Z
CZ < Y < W < X
DZ < Y < X < W
Answer [1]

2023 CGSS O Prelim P1 Q22

20

An aqueous solution has a pH value of 13. What information does this give about the ions present in the solution?

concentration of H+ ionsconcentration of OH− ions
Ahighlow
Bhighhigh
Clowhigh
Dnonehigh
Arow A
Brow B
Crow C
Drow D
Answer [1]

2024 Compassvale O Prelim P1 Q17

21

A few drops of Universal Indicator are added to solutions X and Y.

solutioncolour of Universal Indicator
Xred
Yyellow

Which conclusion is correct?

ASolution X is acidic while solution Y is alkaline.
BSolution X is more alkaline than solution Y.
CSolution X reacts with zinc to give hydrogen gas while solution Y does not react with zinc.
DThe concentration of hydrogen ions in X is higher than in solution Y.
Answer [1]

2024 Zhonghua O Prelim P1 Q19

22

The following statements about dilute sulfuric acid are all correct.

1 A white precipitate is formed when aqueous barium chloride is added.
2 The solution turns anhydrous copper(II) sulfate from white to blue.
3 Addition of Universal Indicator shows that the solution has a pH value of less than 7.0.
4 The solution reacts with copper(II) oxide, forming a blue solution.

Which statements confirm the acidic nature of the solution?

A1 and 2
B1 and 3
C2 and 4
D3 and 4
Answer [1]

2024 BLSS O Prelim P1 Q15

23

Which statements about oxides are correct?

1 An aqueous solution of sulfur dioxide has a pH less than 7.
2 An aqueous solution of potassium oxide turns blue litmus paper red.
3 Carbon dioxide reacts with ammonia to make a salt.
4 Carbon monoxide reacts with hydrochloric acid to make a salt.

A1 and 2
B1 and 3
C2 and 3
D3 and 4
Answer [1]

2024 QTSS O Prelim P1 Q15

24

Which oxide is insoluble in aqueous sodium hydroxide?

AAl2O3
BMgO
CP4O10
DSO2
Answer [1]

2024 SCSS O Prelim P1 Q16

25

A solid nitrate fertiliser reacts with an alkali to produce a gas which turns damp red litmus paper blue. What is the empirical formula of this fertiliser?

ANO3
BNHO3
CNH2O
DN2H4O3
Answer [1]

2023 CGSS O Prelim P1 Q12

26

Which mixture can be separated into its components by adding water, stirring and filtering?

Acalcium carbonate and sodium chloride
Bmagnesium and iron
Csodium chloride and copper(II) sulfate
Dsulfuric acid and hydrochloric acid
Answer [1]

Source: 2024 BLSS O Prelim P1 Q4

27

A student accidentally mixed 50 cm3 of oil and 5 g of solid calcium nitrate. Which sequence of procedures would allow him to obtain a pure sample of solid calcium nitrate most easily?

Adissolve in ethanol, then filtration, then crystallisation
Bdissolve in water, then filtration
Cdissolve in water, then separating funnel, then crystallisation
Dsimple distillation, then crystallisation
Answer [1]

Source: 2024 NASS O Prelim P1-P2 Q2

28

Which sequence of procedures is used to separate a pure, dry sample of hydrated copper(II) sulfate, CuSO4.5H2O, from a mixture containing hydrated copper(II) sulfate and calcium carbonate, CaCO3?

Adissolve in water → distillation → crystallisation
Bdissolve in water → filtration → crystallisation
Cdistillation → crystallisation → heating to remove all water
Dfractional distillation → filtration → heating to remove all water
Answer [1]

Source: 2025 CCHY O Prelim P1 Q3

29

Which method is most suitable for preparing magnesium nitrate?

AAdd excess nitric acid to magnesium oxide. Filter and crystallise the filtrate.
BAdd excess magnesium carbonate to nitric acid. Filter and crystallise the filtrate.
CAdd equal volumes of 0.1 mol/dm3 magnesium hydroxide and 0.1 mol/dm3 nitric acid together.
DAdd equal volumes of aqueous magnesium chloride and aqueous sodium nitrate together and filter.
Answer [1]

2024 Whitley O Prelim P1 Q20

30

Which method of preparation is suitable for making these salts?

titrationmetal + acidmetal carbonate + acidprecipitation
Apotassium nitratesilver chloridecopper(II) sulfatezinc sulfate
Bpotassium nitratezinc sulfatecopper(II) sulfatesilver chloride
Czinc sulfatesodium nitratesilver chloridecopper(II) sulfate
Dzinc sulfatecopper(II) sulfatepotassium nitratesilver chloride
Arow A
Brow B
Crow C
Drow D
Answer [1]

2025 CCHY O Prelim P1 Q21

31

Which three salts are all prepared by precipitation?

Abarium sulfate, calcium nitrate, silver chloride
Bbarium sulfate, lead(II) chloride, silver nitrate
Ccalcium sulfate, lead(II) sulfate, silver chloride
Dcalcium sulfate, lead(II) sulfate, silver nitrate
Answer [1]

2024 YSS O Prelim P1 Q18

32

30 cm3 of 0.1 mol/dm3 aqueous sodium hydroxide is required to exactly neutralise 25 cm3 of dilute sulfuric acid. What is the concentration of the acid?

A0.24 mol/dm3
B0.12 mol/dm3
C0.06 mol/dm3
D0.03 mol/dm3
Answer [1]

2024 CCHM O Prelim P1 Q16

The Periodic Table of Elements, from the A Level Chemistry Data Booklet (8873, 9476, 9813)