Acids, Bases and Salts
From the lesson
25 marksWhich statement about 0.10 mol dm−3 hydrochloric acid and 0.10 mol dm−3 ethanoic acid is correct?
Learners' Alley, Acids, Bases and Salts slides
Which oxide reacts with both dilute hydrochloric acid and aqueous sodium hydroxide?
Learners' Alley, Acids, Bases and Salts slides
What is the conjugate base of HSO4−?
Learners' Alley, Acids, Bases and Salts slides
Which pair of substances could be mixed to make barium sulfate by precipitation?
Learners' Alley, Acids, Bases and Salts slides
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?
Learners' Alley, Acids, Bases and Salts slides
Learners' Alley, Acids, Bases and Salts slides
Learners' Alley, Acids, Bases and Salts slides
Learners' Alley, Acids, Bases and Salts slides
Learners' Alley, Acids, Bases and Salts slides
Learners' Alley, Acids, Bases and Salts slides
In HCl(g) + NH3(g) → NH4Cl(s):
Learners' Alley, Acids, Bases and Salts slides
Suggest starting materials and a method to make each salt.
Learners' Alley, Acids, Bases and Salts slides
Learners' Alley, Acids, Bases and Salts slides
Learners' Alley, Acids, Bases and Salts slides
Learners' Alley, Acids, Bases and Salts slides
Practice
17 marksWhich statement about acids and bases is correct?
2024 Woodlands O Prelim P1 Q12
The table contains data about two acids.
| acid | concentration / mol/dm3 | pH |
|---|---|---|
| hydrochloric acid | 0.1 | 1.0 |
| ethanoic acid | 0.1 | 3.7 |
Which statement best explains the difference in pH values?
2024 BGSS O Prelim P2 Q15
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?
2024 CHS O Prelim P1 Q21
The pH of four solutions of the same concentration is measured using a pH meter.
| solution | hydrochloric acid | sulfuric acid | ethanoic acid | sodium hydroxide |
|---|---|---|---|---|
| pH | W | X | Y | Z |
Which shows the correct order of the pH values?
2023 CGSS O Prelim P1 Q22
An aqueous solution has a pH value of 13. What information does this give about the ions present in the solution?
| concentration of H+ ions | concentration of OH− ions | |
|---|---|---|
| A | high | low |
| B | high | high |
| C | low | high |
| D | none | high |
2024 Compassvale O Prelim P1 Q17
A few drops of Universal Indicator are added to solutions X and Y.
| solution | colour of Universal Indicator |
|---|---|
| X | red |
| Y | yellow |
Which conclusion is correct?
2024 Zhonghua O Prelim P1 Q19
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?
2024 BLSS O Prelim P1 Q15
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.
2024 QTSS O Prelim P1 Q15
Which oxide is insoluble in aqueous sodium hydroxide?
2024 SCSS O Prelim P1 Q16
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?
2023 CGSS O Prelim P1 Q12
Which mixture can be separated into its components by adding water, stirring and filtering?
Source: 2024 BLSS O Prelim P1 Q4
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?
Source: 2024 NASS O Prelim P1-P2 Q2
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?
Source: 2025 CCHY O Prelim P1 Q3
Which method is most suitable for preparing magnesium nitrate?
2024 Whitley O Prelim P1 Q20
Which method of preparation is suitable for making these salts?
| titration | metal + acid | metal carbonate + acid | precipitation | |
|---|---|---|---|---|
| A | potassium nitrate | silver chloride | copper(II) sulfate | zinc sulfate |
| B | potassium nitrate | zinc sulfate | copper(II) sulfate | silver chloride |
| C | zinc sulfate | sodium nitrate | silver chloride | copper(II) sulfate |
| D | zinc sulfate | copper(II) sulfate | potassium nitrate | silver chloride |
2025 CCHY O Prelim P1 Q21
Which three salts are all prepared by precipitation?
2024 YSS O Prelim P1 Q18
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?
2024 CCHM O Prelim P1 Q16
