9. Qualitive Analysis

Question 1

which ion produces green ppt, insoluble in excess when sodium hydroxide is added?

Answer 1

Iron (2)

Question 2

When added aqueous ammonia in zinc ion is the excess insoluble or soluble? If its soluble what is produce when it dissolves in ammonia?

Answer 2

It is soluble in excess and forms a colourless solution

Question 3

Name the 3 cations that has colored precipitate when sodium hydroxide is added and state the color

Answer 3

Cupper (light blue)
Iron 2 (green)
Iron 3( reddish-brown)

Question 4

What is the key word link to chloride ion?

Answer 4

sliver

Question 5

If a white ppt is given out when i add an acid and barium nitrate what is present?

Answer 5

sulfate

Question 6

To test for nitrate:
1. add sodium hydroxide
2. add aluminium foil
3. warm the mixture
what is the last step?

Answer 6

Is to test the gas given off with a piece of damp red litmus paper

Question 7

Name the white ppt produced when CO2 is bubbled into limewater

Answer 7

Calcium Carbonate

Question 8

Which gas will bleach the litmus paper when testing for it?

Answer 8

Chlorine gas

Question 9

what is present when a solid changes from green to black upon heating?

Answer 9

Cupper carbonate= copper oxide and CO2

Question 10

What is present for solid changes from white to yellow and back to white after cooling?

Answer 10

ZnCo3= ZnO + CO2