test

Question 1

Disproportionate

Answer 1

reaction in which single elements is oxidised and reduced simultaneously

Question 2

hallide ions

Answer 2

identified in known solution by dissolving solution in nitric acid
then add silver nitrate solution
Ag+ (aq) + X- (aq) → AgX (s)

Question 3

nitric acid

Answer 3

prev false positives from carbonate ions precipitating out with silver ions

Question 4

hallide test

Answer 4

agcl WHITE precipitation
AGBR cream precipitation
AGI yellow pricipate

Question 5

ammonia

Answer 5

follow up test
dilute followed up by conc ammonia to silver hallide
precipitation dissolves in dilute ammonia is a chloride
precipitation does not dissolve in dilute but dissolves in conc ammonia is a bromide
precipitation doesn’t dissolve in either is iodide

Question 6

carbonate test

Answer 6

1cm3 dilute hcl to test tube
add = sodium carbonate to test tube
bung and delivery tube attached
carbonate present effervescence and c02 and white precipitation

Question 7

sulfate

Answer 7

acidify sample with dilute ccl
few drops of aq barium chloride
present white precipitate

Question 8

ammonia ions

Answer 8

reacting with warm aqueous sodium hydroxide forming ammonia gas
NH4+ (aq) + OH- (aq) → NH3 (g) + H2O (l)

Ammonia gas is produced.
Ammonia gas can be identified by its pungent smell or by turning red litmus paper blue

Question 9

carbonate formula

Answer 9

CO32- (aq) + 2H+ (aq) → CO2 (g) + H2O (l)
CO2 (g) + Ca(OH)2 (aq) → CaCO3 (s) + H2O (l)

Question 10

sulfate formula

Answer 10

Ba2+ (aq) + SO42- (aq) → BaSO4 (s)