3.1.4 qualitative analysis

Question 1

What is the test for carbonates and what do you observe

Answer 1

-Add dilute HCl
-effervescence

Question 2

what is the ionic equation for test for carbonates

Answer 2

Co3 2-(aq) + 2H+ (aq) -> Co2(g) + H2O (l)

Question 3

what is the test for sulphates

Answer 3

-add dilute HCl
-add barium chloride
-if barium sulphate is present you will get a white precipitate as its insoluble in water

Question 4

what is the ionic equation for test for sulphates

Answer 4

Ba 2+ (aq) + SO4 2- (aq) -> BaSO4 (s)

Question 5

what is the test for halides

Answer 5

-add nitric acid
-followed by silver nitrate solution

Question 6

what colour precipitate does
Cl-
Br-
I-

Answer 6

Cl-white
Br-cream
I-yellow

Question 7

describe AgX solubility in ammonia

Answer 7

in booklet

Question 8

what is the ionic equation for halides

Answer 8

Ag + (aq) + x- (aq) -> Agx (s)

Question 9

describe the test for ammonia

Answer 9

Add NaOH then warm the mixture NH3 should be produce
you can test for NH3 by using damp red litmus paper which should turn blue if its present

Question 10

what is the ionic equation for ammonia

Answer 10

NH4 + (aq) + OH- (aq) -> NH3 (g) + H2O (g)

Question 11

what is the order of tests

Answer 11

carbonates (no co2)
sulphates (no precipitates)
halides