preparation of salts

Preparation of salts

Multiple Choice

Which of the following statements best define the term ‘salt’?

• Salt is formed when metal reacts with an alkali.

• Salt contains sodium ions and chloride ions.

• Salt is formed from a weak Van der Waals’ forces of attraction.

• Salt is formed when the hydrogen ions in an acid is replaced by metal or ammonium ions.

Preparation of insoluble salts

Multiple Choice

Which of the following methods can be used to dry the solid?

I) using a filter paper

II) put it in a desiccator

III) Put it in an oven

• I & II only

• I & III only

• II & III only

• I, II & III

Multiple Choice

In order to obtain an insoluble salt from a mixture, which of the following method shhould be used?

• filtration

• crystallization

• distillation

• evaporation

Multiple Choice

Which is the most suitable method for separating the products of the reaction below:

NaCl (aq) + AgNO₃ (aq) --> AgCl (s) + NaNO₃ (aq)

• chromatography

• crystallisation

• distillation

• filtration

Multiple Choice

Bryan wants to prepare silver chloride in the science laboratory. Which of the following reactants should he use?

• silver + hydrochloric acid

• silver hydroxide + hydrochloric acid

• silver nitrate + potassium chloride

• silver + chlorine gas

Multiple Choice

Precipitation involves mixing ___________ to form an insoluble solid that separates out from the reaction mixture.

• acid and alkali

• acid and metal

• two acids

• two solutions

Multiple Select

Which of the following is/are insoluble salt(s)?

• barium sulphate

• magnesium nitrate

• silver nitrate

• sodium carbonate

Multiple Choice

Which method is used to prepare lead (II) chloride?

• Pb(NO₃)₂(aq) + NaCl (aq) --->

• PbSO₄(s)+ NaCl (aq) --->

• PbCO₃(s) + NaCl (aq) --->

Multiple Select

Choose all possible reactants that can be used to provide the cation to prepare the insoluble salt zinc carbonate

• zinc

• zinc hydroxide

• zinc sulfate

• zinc chloride

Multiple Choice

Which method is used to prepare barium sulphate?

• Add excess solid reactant to acid

• Titration

• Precipitation

Multiple Choice

Which of the following is insoluble?

• silver chloride

• zinc chloride

• potassium chloride

• ammonium chloride

Preparation of soluble salts using titration

( you need a soluble base and a soluble acid)

Multiple Choice

Which method is used to prepare soluble salts from Group 1?

• Electrolysis

• Titration

• Haber Process

• Precipitation method

Multiple Choice

What is a titration?

• when the moles of hydrogen ions is equal to the moles of hydroxide ions

• adding a known amount of solution of known concentration to determine the concentration of an unknown

• reaction in which an acid and a base react in an aqueous solution to produce a salt and water

• the extent of ionization of an acid or base

Multiple Choice

Which method of preparation of a pure salt solution requires the use of a pipette and burette?

• BaCl₂ + Na₂SO₄ --> BaSO₄ + 2NaCl

• CuO + HCl --> CuCl₂ + H₂O

• NaOH + HCl --> NaCl + H₂O

• MgCO₃ + H₂SO₄ --> MgSO₄ + H₂O + CO₂

Multiple Choice

Which of the following can be prepared by titration?

• Magnesium sulfate

• Zinc carbonate

• Lead (II) sulfate

• Lithium chloride

Multiple Choice

After titrating aqueous NaOH with dilute HCl without indicator, what is my next step to obtain a sample of NaCl ?

• Filtration

• Evaporation to dryness

• Repeat the titration

• Evaporate to saturation, then cool the solution

Multiple Choice

How would you prepare a sample of potassium chloride safely in the laboratory?

• Add excess potassium metal to dilute hydrochloric acid

• Titrate dilute HCl with aqueous KOH with an indicator

• Titrate dilute HCl with aqueous KOH once with indicator, then again without

• Mix aqueous potassium nitrate with aqueous sodium chloride

Multiple Choice

__________ are soluble.

• All carbonates

• All chlorides

• All nitrates

• All sulfates

Preparing a salt by using an insoluble base and an acid

(Make note of the conditions and requirements)

Multiple Choice

Zinc nitrate can be prepared by reacting nitric acid with excess solid. Which of the following solids cannot be used in the preparation of calcium nitrate?

• Zinc

• zinc sulphate

• zinc oxide

• zinc carbonate

Multiple Choice

How can I prepare a sample of copper(II) sulfate?

• Add excess Cu metal to H₂SO₄

• Add Cu(NO₃)₂ (aq) to Na₂SO₄(aq)

• Add excess CuCO₃ to H₂SO₄

• Titrate Cu(OH)₂ to NaOH

Multiple Choice

Which of the following methods is used to prepare zinc sulfate?

• Add excess zinc chloride to aqueous sodium sulfate

• Tiltrate dilute H₂SO₄ with aqueous Zn(OH)₂ with an indicator, then again without

• Add excess solid zinc oxide to dilute sulfuric acid

• Mix aqueous zinc nitrate with aqueous potassium sulfate

Multiple Choice

State a reason why filtration is carried out during the preparation of Copper (II) sulphate when copper (II) oxide is added to dilute Sulphuric (VI)?

• To dry Copper (II) Sulphate

• To remove water

• To remove unreacted Copper (II) oxide

• To speed up the rate of reaction

Multiple Choice

Why is excess Copper (II) oxide added to dilute Sulphuric (VI) acid during the preparation of Copper (II) sulphate?

• To ensure that all the Copper (II) oxide has reacted

• To remove excess Copper (II) oxide

• To ensure that all the acid has reacted

• To ensure that the salt is formed faster

Multiple Choice

Which of the following methods is used to prepare zinc sulfate?

• Add excess zinc chloride to aqueous sodium sulfate

• Tiltrate dilute H₂SO₄ with aqueous Zn(OH)₂ with an indicator, then again without

• Add excess solid zinc oxide to dilute sulfuric acid

• Mix aqueous zinc nitrate with aqueous potassium sulfate

Multiple Choice

Calcium chloride is prepared from ______________ and hydrochloric acid

• Calcium carbonate

• Calcium

• Calcium oxide

• all of the above

Using the acid +metallic carbonate method to prepare salts

Multiple Choice

Which of the following methods is used to prepare zinc sulfate?

• Add excess zinc chloride to aqueous sodium sulfate

• Tiltrate dilute H₂SO₄ with aqueous Zn(OH)₂ with an indicator, then again without

• Add excess solid zinc oxide to dilute sulfuric acid

• Mix aqueous zinc nitrate with aqueous potassium sulfate

Multiple Choice

How can I prepare a sample of copper(II) sulfate?

• Add excess Cu metal to H₂SO₄

• Add Cu(NO₃)₂ (aq) to Na₂SO₄(aq)

• Add excess CuCO₃ to H₂SO₄

• Titrate Cu(OH)₂ to NaOH

Multiple Choice

Which pair of reagents can be used to prepare copper(II) sulfate salt?

• Copper metal with dilute sulfuric acid

• Copper(II) nitrate with sodium sulfate

• Copper(II) chloride and dilute sulfuric acid

• Copper(II) carbonate with dilute sulfuric acid

Multiple Select

Zinc nitrate can be prepared by reacting nitric acid with excess solid. Which of the following solids can be used in the preparation of zinc nitrate?

• Zinc

• zinc sulphate

• zinc oxide

• zinc carbonate

Fill in the Blank

lead carbonate on reaction with nitric acid gives________________

Fill in the Blank

metal carbonate on reaction with acids give salt, carbon dioxide and____________

Multiple Choice

Zinc nitrate can be prepared by reacting nitric acid with excess solid. Which of the following solids cannot be used in the preparation of Zinc nitrate?

• Zinc

• zinc sulphate

• zinc oxide

• zinc carbonate

Using the metal plus acid reaction to prepare salts

Multiple Choice

Which element reacts with dilute sulfuric acid to produce hydrogen?

• carbon

• zinc

• copper

• chlorine

Multiple Choice

Some reactions of a substance, R, are shown in the diagram.

What type of substance is R? acid

• a salt

• a base

• an element

• an acid

Multiple Choice

Which substance reacts with zinc to form a salt?

• oxygen

• water

• hydrochloric acid

• nitrogen

Multiple Choice

Which of the following mixture will react to produce an aqueous zinc nitrate solution?

I Zinc carbonate and dilute nitric acid.

II Zinc oxide and dilute nitric acid.

III Zinc oxide and potassium nitrate solution.

IV Zinc and aqueous sodium nitrate solution.

• I and II

• II and III

• III and IV

• I and IV

Multiple Choice

What is the method to prepare silver chloride?

• Adding HCl to Ag

• Adding HCl to Ag2CO3

• Adding AgNO3 to HCl

• Adding HCl to Ag2O

Multiple Choice

How can I prepare a sample of copper(II) sulfate?

• Add excess Cu metal to H₂SO₄

• Add Cu(NO₃)₂ (aq) to Na₂SO₄(aq)

• Add excess CuCO₃ to H₂SO₄

• Titrate Cu(OH)₂ to NaOH

Multiple Choice

Which pair of reagents can be used to prepare copper(II) sulfate salt?

• Copper metal with dilute sulfuric acid

• Copper(II) nitrate with sodium sulfate

• Copper(II) chloride and dilute sulfuric acid

• Copper(II) carbonate with dilute sulfuric acid

Multiple Choice

Zinc granules on treating with an acid X, forms zinc sulphate (ZnSO4) salt along with the evolution of a gas Y which burns with a pop sound when brought near to a burning candle. Identify the acid X and gas evolved Y.

• X-Sulphuric acid and Y- Oxygen gas

• X- Hydrochloric acid and Y- Oxygen gas

• X- Sulphuric acid and Y- Hydrogen gas

• X- Hydrochloric acid and Y- Hydrogen ga

Multiple Choice

Identify the gas evolved.

• Hydrogen

• Nitrogen

• Carbon dioxide

• Oxygen

Multiple Choice

Calcium chloride is prepared from ______________ and hydrochloric acid

• Calcium carbonate

• Calcium

• Calcium oxide

• all of the above

Multiple Choice

calcium on reaction with sulfuric acid gives:

• Calcium chloride

• Calcium carbonate

• Calcium nitrate

• Calcium sulfate

Multiple Choice

on replacing zinc granules with zinc block, the rate of reaction with sulfuric acid becomes

• faster

• remains unchanged

• slower

Multiple Choice

reaction of silver with concentrated sulfuric acid gives:

• silver sulfate

• no reaction

• silver chloride

• silver nitrate

Multiple Choice

Which of the following method is suitable to prepare iron(II) sulphate?

• FeCl₂ + H₂SO₄ --->

• Fe(NO₃)₂ + H₂SO₄ --->

• Fe + H₂SO₄ --->

• Fe(OH)₂ + H₂SO₄ --->

Preparing salts by direct combination

When can direct combination be used to prepare a salt ?

• When the salt does not contain a metal from either group 1 or 2

• When the salt is BINARY i.e. it only contains two elements

• Example it can be used to prepare iron chloride but not iron sulphate

Multiple Select

Which salt can be prepared using a direct combination?

• Iron Hydroxide

• Iron chloride

• iron sulphate

• iron sulphide

The end