Practise acids-bases-salts questions by applying proton definitions, choosing salt reagents and sequencing crystal preparation.
This question is about Group 2 elements and their compounds.
Which of these compounds is an insoluble solid?
calcium nitrate
calcium sulfate
magnesium nitrate
magnesium sulfate
B
This question is about salts.
Soluble salts can be prepared by the reaction between a metal oxide and an acid.
The equation for this type of reaction is
State, in terms of protons, what happens in this reaction.
acid donates proton(s)/base accepts proton(s)
ALLOW metal oxide for
base
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.
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
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?
as a neutron donor
as a neutron acceptor
as a proton donor
as a proton acceptor
C