Edexcel IGCSE Chemistry acids, bases and salt preparations
Practise acids-bases-salts questions by applying proton definitions, choosing salt reagents and sequencing crystal preparation.
- Syllabus
- First assessment 2019
- Course
- Chemistry 4CH1
Exam points
- Link acids to proton donation and bases to proton acceptance in reaction statements.
- Use solubility rules to choose reagents and predict precipitates in salt preparations.
- Describe filtering, evaporating, crystallising and drying to obtain pure salts.
Covered syllabus points
2.34 Solubility rules2.35 Acids and bases as proton transfer2.36 Proton donors and acceptors2.37 Acid reactions2.38 Bases and alkalis2.39 Preparing soluble salts from insoluble reactants2.40C Preparing soluble salts by titration2.41C Preparing insoluble salts2.42 Soluble salt practical2.43C Prepare a sample of pure, dry lead(II) sulfate
(g) Acids, bases and salt preparations question 1
[Maximum number: 1]
This question is about Group 2 elements and their compounds.
Which of these compounds is an insoluble solid?
A
calcium nitrate
B
calcium sulfate
C
magnesium nitrate
D
magnesium sulfate
B
(g) Acids, bases and salt preparations question 2
[Maximum number: 6]
This question is about salts.
Question (a)
(a)
Soluble salts can be prepared by the reaction between a metal oxide and an acid.
The equation for this type of reaction is
metal oxide + acid → salt + water
[ 1 ]
Question (i)
(i)
State, in terms of protons, what happens in this reaction.
[ 1 ]
acid donates proton(s)/base accepts proton(s)
ALLOW metal oxide for
base
Question (b)
(b)
A student is given 50 cm3 of dilute sulfuric acid and a bottle of solid copper(II) carbonate.
Describe the method that the student should use to prepare a saturated solution of copper(II) sulfate.
In your answer, refer to the pieces of apparatus that the student should use.
[ 5 ]
description including
M1 appropriate use of at least three named pieces of apparatus
AND any four of the following points
M2 add copper(II) carbonate to (dilute sulfuric) acid (a spatula/little at a time and stir after each addition)
M3 until no more effervescence
M4 filter (to remove excess copper(II) carbonate/to obtain (copper(II) sulfate) solution)
M5 heat/warm filtrate/(copper(II) sulfate) solution until crystals start to appear (solution saturated) OWTTE
M6 filter to obtain (the saturated) solution
ALLOW until no more reacts/dissolves
ALLOW until in excess
(g) Acids, bases and salt preparations question 3
[Maximum number: 1]
Sodium hydroxide dissolves in water, forming a strongly alkaline solution.
Ammonia dissolves in water, forming a slightly less alkaline solution.
When ammonia solution reacts with sulfuric acid, a neutralisation reaction occurs and ammonium sulfate forms.
How does the sulfuric acid act in this reaction?
A
as a neutron donor
B
as a neutron acceptor
C
as a proton donor
D
as a proton acceptor
C
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