Chemical tests (UNFINISHED)

Question 2

How do you test for sulfates?

Answer 2

To test for sulfate ions add dilute HCL followed by BACL2

If a white precipitate of barium sulfate forms then a sulfate was present

(BA2(aq)+ + SO42(aq)- –> BaSO4(s))

Question 3

How do you test for halides? (Iodine, bromine and chlorine)

Answer 3

To test for chloride, bromide and iodide ions add a certain volume of nitric acid (HNO3) followed by a certain volume silver nitrate solution (AgNO3)

Question 4

What forms if chloride is present in a halide test?

Answer 4

A white precipitate

Ag+(aq) + Cl-(aq) –> AgCl(s)

Question 5

What forms if bromide is present in a halide test?

Answer 5

A cream precipitate

Ag+(aq) + Br- –> AgBr(s)

Question 6

What forms if iodide is present in a halide test?

Answer 6

A yellow precipitate

Ag+(aq) + I-(aq) –> AgI(s)

Question 7

How do you test for chlorine gas?

Answer 7

Chlorine bleaches damp blue litmus paper white

Question 8

How would you test for oxygen gas?

Answer 8

Oxygen relights a glowing splint

Question 9

How would you test for carbon dioxide gas?

Answer 9

Carbon dioxide turns limewater cloudy

Question 10

How would you test for hydrogen gas?

Answer 10

Hydrogen makes a squeaky pop with a lighted splint

Question 11

How would you test for ammonia gas?

Answer 11

Ammonia gas turns damp red litmus paper blue

Question 12

What color is the flame when lithium is tested using a flame test?

Answer 12

Red

Question 13

What color is the flame when sodium is tested using a flame test?

Answer 13

Yellow

Question 14

What color is the flame when potassium is tested using a flame test?

Answer 14

Lilac

Question 15

What color is the flame when calcium is tested using a flame test?

Answer 15

Orange red

Question 16

What color is the flame when copper is tested using a flame test?

Answer 16

Blue green

Question 17

How would you test for Copper(II) metal hydroxide using NaOH?

Answer 17

Add a certain volume of NaOH to the solution of copper solution
If a blue precipitate forms copper (II) is present

Cu2+(aq) + 2OH-(aq) –> Cu(OH)2(s)

Question 18

How would you test for iron(II) metal hydroxide using NaOH?

Answer 18

Add a certain volume of NaOH to the solution of iron(II) solution
If a green precipitate forms iron(II) is present

Fe2+(aq) + 2OH-(aq) –> Fe(OH)2(s)

Question 19

How would you test for iron(III) metal hydroxide using NaOH?

Answer 19

Add a certain volume of NaOH to the solution of iron(III) solution
If a brown precipitate forms iron (III) is present

Fe3+(aq) + 30H-(aq) –>Fe(OH)3(s)