Chemistry 5070 · O Level
Preparation of salts
63 practice questions on Preparation of salts, with worked solutions and instant marking.
You are given dilute hydrochloric acid, together with • solid copper, • solid magnesium, • lead nitrate in aqueous solution, • silver nitrate in aqueous solution. How many different insoluble chlorides could you prepare?
May/June 2015
The flow chart displays several reactions involving copper(II) nitrate, $\text{Cu(NO}_3)_2$.
May/June 2015
When gently heated, an aqueous solution of ammonium nitrite, $\text{NH}_4\text{NO}_2$, breaks down. $\text{NH}_4\text{NO}_2(\text{aq}) \rightarrow \text{N}_2(\text{g}) + 2\text{H}_2\text{O}(\text{l})$.
May/June 2015
Ammonium carbonate, $(\text{NH}_4)_2\text{CO}_3$, is a white solid used in ‘smelling salts’. When it is heated, it breaks down. $(\text{NH}_4)_2\text{CO}_3(s) \rightarrow 2\text{NH}_3(g) + \text{H}_2\text{O}(g) + \text{CO}_2(g)$.
May/June 2015
Describe the visible appearance of zinc.
May/June 2015
Which two substances can be mixed with water and stirred to make a sample of lead(II) chloride?
May/June 2016
How can a pure sample of barium sulfate be prepared from barium carbonate?
May/June 2016
Samples containing one mole of each solid carbonate of lead, calcium, barium and magnesium are reacted separately with excess dilute sulfuric acid. Which carbonate sample will produce the largest volume of carbon dioxide?
May/June 2016
In which reaction do two of the products consist of salts?
May/June 2016
The formula of silver nitrate is AgNO$_3$.
May/June 2016
Lead(II) nitrate has the formula Pb(NO$_3$)$_2$.
May/June 2016
Lead(II) sulfate can be prepared by reacting dilute sulfuric acid with what substance?
May/June 2017
Alkalis neutralise acids.
May/June 2017
Copper can react with concentrated nitric acid. $\text{Cu}(s) + 4\text{HNO}_3(aq) \rightarrow \text{Cu(NO}_3)_2(aq) + 2\text{NO}_2(g) + 2\text{H}_2\text{O}(l)$
May/June 2017
Acids are neutralised by insoluble bases.
May/June 2017
Pure lead(II) sulfate is made by combining two substances, X and Y. Once the reaction has finished, the mixture is filtered, and pure lead(II) sulfate is collected. Which row shows the best method for preparing pure lead(II) sulfate?
May/June 2018
Which two reagents are most appropriate for preparing copper(II) chloride in the laboratory?
May/June 2018
Barium chloride dissolves in water, whereas barium sulfate is insoluble.
May/June 2018
Silver chloride, $\text{AgCl}$, is an insoluble salt whereas silver nitrate is a soluble salt.
May/June 2018
What is the most suitable method for obtaining a pure sample of copper(II) sulfate?
May/June 2019
Which method is most suitable for preparing a sample of silver chloride?
May/June 2019
Ammonium sulfate is a salt used as a fertiliser. A student is making some ammonium sulfate crystals by neutralisation. She uses dilute sulfuric acid together with aqueous ammonia. The diagrams show some of the apparatus available to the student.
May/June 2019
Salts may be made in the laboratory by several different methods. Describe a suitable way to obtain a pure, dry sample of each named salt. In your response, include the names of any techniques, apparatus and chemicals that are used.
May/June 2019
Two unfinished statements about how an insoluble salt is prepared are given below. "……1…… may be used to make insoluble salts, such as ……2…… . The salt is obtained by ……3…… and is then ……4…… ." Which words fit gaps 1-4 correctly?
May/June 2021
A student reacts dilute sulfuric acid with copper(II) carbonate to obtain a pure, dry sample of blue copper(II) sulfate crystals. Dilute sulfuric acid is colourless. Copper(II) carbonate is an insoluble green powder. The equation for the reaction is shown. $\text{H}_2\text{SO}_4\text{(aq)} + \text{CuCO}_3\text{(s)} \rightarrow \text{CuSO}_4\text{(aq)} + \text{CO}_2\text{(g)} + \text{H}_2\text{O}\text{(l)}$
May/June 2021
Which method should be used to obtain a pure sample of potassium chloride?
May/June 2022
A pure sample of lead sulfate is prepared by mixing two aqueous salt solutions. The precipitated lead sulfate is then removed from the reaction mixture. Which solutions are used, and how is the lead sulfate separated?
May/June 2022
A sample of magnesium is added to dilute hydrochloric acid. The mixture is then evaporated, and a solid residue of magnesium chloride is left behind. Which statement is correct?
May/June 2022
The flow chart outlines how ammonium sulfate is prepared. What are elements 1-4?
May/June 2022
A sample of an alloy made up of aluminium and copper is placed in hot dilute sulfuric acid. The dilute sulfuric acid reacts only with the aluminium. Hydrogen and aqueous aluminium sulfate are formed in the reaction.
May/June 2022
This question concerns how salts are made.
May/June 2023
This question concerns how salts are prepared.
May/June 2023
In a school laboratory, which two reagents are used to prepare a sample of pure barium sulfate?
May/June 2024
By what method can a pure sample of barium sulfate be prepared from barium carbonate?
May/June 2025
What process is used to prepare soluble salts?
Oct/Nov 2015
A student changes copper(II) oxide into copper(II) sulfate.
Oct/Nov 2015
A student is given five reagents: dilute hydrochloric acid, dilute sulfuric acid, dilute nitric acid, solid calcium carbonate, and solid copper(II) carbonate. How many soluble salts could be prepared?
Oct/Nov 2016
Which reagent can be used to react with dilute hydrochloric acid so as to produce silver chloride?
Oct/Nov 2017
When dilute ethanoic acid reacts with sodium carbonate, sodium ethanoate, CH$_3$COONa, together with two further compounds, is produced.
Oct/Nov 2017
Which combination of conditions is employed in the contact process?
Oct/Nov 2018
When propanoic acid reacts with calcium carbonate, the substances formed are calcium propanoate, carbon dioxide and water. What is the equation for this reaction?
Oct/Nov 2019
The diagrams illustrate three stages, 1, 2 and 3, in the making of a salt. Which row gives the correct solubilities of both the reactants and the salt produced in this preparation?
Oct/Nov 2019
Since lead(II) chloride is an insoluble salt, Which two reagents are needed to prepare a pure sample of lead(II) chloride?
Oct/Nov 2020
Which of these salts can be made by precipitation?
Oct/Nov 2020
This question concerns several sulfur compounds.
Oct/Nov 2020
Which compound can be prepared by precipitation?
Oct/Nov 2021
Which compound can be produced by precipitation?
Oct/Nov 2021
Which methods can be used to prepare a pure sample of copper(II) sulfate? 1. acid reacting with a metal carbonate 2. acid reacting with a metal oxide 3. acid reacting with a metal 4. precipitation method
Oct/Nov 2021
This question focuses on sulfuric acid and sulfates.
Oct/Nov 2021
Which substance is made to react with dilute sulfuric acid during the preparation of a pure sample of lead(II) sulfate?
Oct/Nov 2022
Propanoic acid reacts with calcium carbonate, producing calcium propanoate, carbon dioxide and water. What is the equation for this reaction?
Oct/Nov 2022
Which substance is used in the preparation of a pure sample of lead(II) sulfate and reacts with dilute sulfuric acid?
Oct/Nov 2022
A pure sample of a salt is produced by filtering the mixture and then evaporating the filtrate. Which pair of reagents would form the salt?
Oct/Nov 2022
Which combination of conditions is used in the Contact process?
Oct/Nov 2022
Propanoic acid reacts with calcium carbonate, producing calcium propanoate, carbon dioxide and water. What equation represents this reaction?
Oct/Nov 2022
A student is given five reagents: dilute hydrochloric acid; dilute sulfuric acid; dilute nitric acid; solid calcium carbonate; solid copper(II) carbonate. How many soluble salts are able to be prepared using these five reagents?
Oct/Nov 2023
Ammonium sulfate is a salt that is used in fertilisers. Ammonium sulfate is made by neutralising dilute sulfuric acid with aqueous ammonia. Plan an experiment to produce pure dry crystals of ammonium sulfate. Your plan should make use of: • common laboratory apparatus • dilute sulfuric acid • aqueous ammonia • methyl orange indicator. No other chemicals should be used. Your plan should state: • the apparatus needed • the method to use. You may include a diagram to help answer the question.
Oct/Nov 2023
Copper(II) sulfate is a salt used for killing pests on plant leaves. It is made by neutralising dilute sulfuric acid with solid copper(II) oxide. Devise an experiment to obtain pure dry crystals of copper(II) sulfate. Your plan should make use of common laboratory apparatus, dilute sulfuric acid, and solid copper(II) oxide. No other chemicals should be used.
Oct/Nov 2023
Which combination of conditions is employed in the Contact process?
Oct/Nov 2024
A student is given suitable apparatus, distilled water and the reagents listed below. solid magnesium hydroxide; solid lead carbonate; dilute nitric acid; aqueous sodium chloride; aqueous sodium sulfate. Which salts is the student able to make as a pure dry sample?
Oct/Nov 2024
The table lists four methods for preparing pure salts. Which row identifies a method for making a pure sample of each named salt?
Oct/Nov 2024
A student carries out an experiment to prepare pure hydrated copper(II) sulfate crystals, $\text{CuSO}_4\cdot5\text{H}_2\text{O}$.
Oct/Nov 2024
Copper(II) oxide reacts with dilute ethanoic acid. Which equation correctly represents this reaction?
Oct/Nov 2025