qualitative ions tests

Question 1

What do halide ions produce?

Answer 1

Aqueous halide ions + aqueous silver ions form ppt of solid silver halides

Question 2

What is the halide test for chlorine?

Answer 2

ag^+ + cl^- = agcl(s)
white ppt

Question 3

what is the halide test for bromine?

Answer 3

ag^+ + Br^- = AgBr(s)
cream ppt

Question 4

what is the halide test for iodine?

Answer 4

Ag^+ + I^- = AgI(s)
yellow ppt

Question 5

after carrying out the halide tests, what do you do to tell the halides apart?

Answer 5

add the aqueous ammonia solution
AgCl- soluble in dilute
AgBr- soluble in conc
AgI- not soluble even in conc

Question 6

Carbonate tests:

Answer 6

add dilute acid
if present Co2 is produced and there is fizzing

Question 7

Sulfate tests:

Answer 7

add solution of Ba2+ ions - Ba(No2)3
produces BaSo4 and white ppt

Question 8

What is the order of tests for cations?

Answer 8

Carbonate tests
Sulfate tests
Halide tests

Question 9

What is the order of tests for anions?

Answer 9

Carbonate tests- add CO3 in excess until bubbling stops

Sulfate tests- add Ba(NO3)2 in excess then filter out BaSO4

Then do halide tests

Ammonium- add NaOH- warm damp red litmus paper at lip of boiling tube and this should turn blue