Unit 7 - Analysis

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Total cards: 24•Content version: v4•Public deck•Updated: 8/1/2026

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Front (Question)

Test for ammonia

Back (Answer)

• it has a pungent smell • turns damp red litmus paper blue • with the stopper of concentrated HCl it gives a white smoke (ammonium chloride)

Front (Question)

Test for Cu++ (copper)

Back (Answer)

Dissolve compound in water and add dilute sodium hydroxide. If test is positive, a pale blue precipitate will be formed. Cu++ + 2OH- –> Cu(OH)2

Front (Question)

Test for Fe++ (iron II) ions

Back (Answer)

Dissolve compound in water and add dilute sodium hydroxide. If test is positive, a moss green precipitate will be formed. Fe++ + 2OH- –> Fe(OH)2

Front (Question)

What happens when you dissolve potassium, sodium, or ammonium ions in sodium hydroxide

Back (Answer)

There is no precipitate as these hydroxides are soluble in water

Front (Question)

Test for Cl- (chloride) ions

Back (Answer)

Dissolve the compound in water. Add aqueous silver nitrate and dilute aqueous nitric acid. If test is positive a white precipitate will form. Ag+ + Cl- –> AgCl

Front (Question)

How to perform a flame test

Back (Answer)

Use a clean platinum wire Dip it in concentrated hydrochloric acid Dip it in powdered compound View the colour of the flame

Front (Question)

Ion gives a brick red flame in a flame test

Back (Answer)

Ca++ (calcium)

Front (Question)

What colour gives an intense yellow flame in a flame test

Back (Answer)

Na+ (sodium)

Front (Question)

What ion gives a green (blue centre) flame in a flame test

Back (Answer)

Cu++ (copper)

#10

Front (Question)

What ion gives a lilac flame in a flame test

Back (Answer)

K+ (potassium)

#11

Front (Question)

What ion gives a bright red flame in a flame test

Back (Answer)

Li+ (lithium)

#12

Front (Question)

Test for ion Br- (bromide)

Back (Answer)

Dissolve the compound in water. Add aqueous silver nitrate and dilute aqueous nitric acid. If test is positive a cream precipitate will form (silver bromide)

#13

Front (Question)

Test for I- (iodide) ions

Back (Answer)

Dissolve the compound in water. Add aqueous silver nitrate and dilute aqueous nitric acid. If test is positive a primrose yellow precipitate will be formed (silver iodide)

#14

Front (Question)

Test for the anion SO4 – (sulfate)

Back (Answer)

Dissolve the compound in water and add aqueous barium chloride solution (and HCl to remove carbonates). BaSO4 is insoluble in water so a white precipitate will form.

#15

Front (Question)

Test for anion CO3 – (carbonate)

Back (Answer)

Add dilute HCl. If there is effervescence it is either CO2 or H2. If the gas is CO2 then a carbonate is present CO3 – + 2H+ –> CO2 + H2O

#16

Front (Question)

Test for hydrogen

Back (Answer)

Lit splint in gas gives a squeaky pop

#17

Front (Question)

Hazards of hydrogen

Back (Answer)

It’s highly flammable (could explode)

#18

Front (Question)

Test for oxygen

Back (Answer)

Glowing splint relights in gas

#19

Front (Question)

Hazards of ammonia

Back (Answer)

It’s poisonous

#20

Front (Question)

Test for carbon dioxide

Back (Answer)

Bubble gas through limewater, it goes milky (goes clear again after a while)

#21

Front (Question)

Test for chlorine gas

Back (Answer)

Damp litmus paper is bleached white

#22

Front (Question)

Hazards of chlorine

Back (Answer)

It’s highly poisonous

#23

Front (Question)

Test for water vapour

Back (Answer)

Anhydrous copper sulfate turns from white to blue

#24

Front (Question)

Test for NH4+ (ammonium)

Back (Answer)

Dissolve the compound in an alkali (sodium hydroxide) and heat it. On heating, ammonia is less soluble, so it is released. NH4+ (s) + OH- (aq) –> NH3 (g) + H2O (g)