qualitative analysis (chem) Flashcards
(28 cards)
Name a metal that could be pink in colour.
copper
What is the name of a green coloured carbonate?
copper (II) carbonate
Name a chloride salt which can dissolved in water to give a yellow solution.
iron (III) chloride
Which solid(s) is/are black in colour?
copper(II) oxide
carbon powder
iodine crystals
In which reaction is the sulfate ion removed from the solution?
- 2NaOH + H2SO4 → Na2SO4 + 2H2O
- Na2CO3 + H2SO4 → Na2SO4 + H2O + CO2
- BaCl2 + H2SO4 → BaSO4 + 2HCl
- ZnCl2 + H2SO4 → ZnSO4 + 2HCl
3.
Carbon dioxide forms a ______
with limewater.
white precipitate
The name of the only common alkaline gas is _______
ammonia
The name of the gas that bleaches damp litmus papers is _______
chlorine
Sulfur dioxide when bubbled through acidified potassium manganate (VII) turns the colour of the solution from ________
to _______
purple; colourless
Hydrogen gas extinguishes a ______
splint with a ‘pop’ sound.
lighted
Which two gases each change the colour of damp red litmus paper?
ammonia and chlorine
The metal ions react with the ________ ions in aqueous sodium hydroxide or aqueous ammonia to form insoluble ________ which appear as precipitates.
hydroxide; metal hydroxides
The identity of the cation is confirmed by the ________
of the precipitate and its _______
in excess reagent.
colour; solubility
The names of of cations which form precipitates that dissolve in excess aqueous sodium hydroxide are ________ ion and ________ ion.
aluminium; zinc
The names of the cations which form precipitates that dissolve in excess aqueous ammonia are
________ ion and _________ ion.
zinc; copper(II)
Iron(II) ion forms a ______ precipitate with aqueous sodium hydroxide which is _________ in the excess reagent. The name of the precipitate is ________
green; insoluble; iron(II) hydroxide
Copper(II) ion forms a ____ precipitate with aqueous ammonia which is _______ in the excess reagent to form a _______ solution. The name of the precipitate is __________
blue; soluble; dark blue; copper(II) hydroxide
We test for carbonate ions by adding dilute ______ which react to produce __________ gas.
acid; carbon dioxide
Iodide ions in an aqueous solution are tested by the addition of nitric acid followed by ____________ . A
_________ precipitate will be obtained if iodide ions are present.
aqueous silver nitrate; yellow
To test for nitrate ions, the unknown is warmed with aqueous
___________ and _________foil, ________ gas is evolved if nitrate ions are present.
sodium hydroxide; aluminium; ammonia
The presence of _______ ions in an aqueous solution is tested by addition of aqueous acidified barium nitrate. A _______ is observed in a positive test.
sulfate; white precipitate
A colourless solution of X reacts with acidified aqueous silver nitrate to give a white precipitate. What could X be?
1. copper(II) chloride
2. potassium chloride
3. calcium iodide
4. sodium sulfate
potassium chloride
Solutions of Group 1 metal compounds are usually colourless.
In the decomposition of copper(II) nitrate as shown in the above video, the name of the brown gas evolved is _______ and this gas turns damp blue litmus paper red which shows that this gas is _______. Oxygen gas is also formed and it _______ a
_________ splint. The name of the black solid residue left after the reaction is ________
nitrogen dioxide; acidic; relights; glowing; copper(II) oxide
In the decomposition of zinc carbonate as shown in the video, the name of the gas evolved is
_________ which forms a __________ when bubbled into limewater. The colour of zinc oxide solid formed is
________ when hot and _______ when cold.
carbon dioxide; white precipitate; yellow; white
