Chemical Analysis Paper 2

Question 1

What is the test and results for oxygen

Answer 1

Put a glowing splint in a test tube with oxygen and if oxygen is present it will relight

Question 2

What is the test for chlorine

Answer 2

Place damp litmus paper in the chlorine and if chlorine is present it will bleach/turn yellow

Question 3

What is the test for carbon dioxide

Answer 3

Lime water will turn cloudy

Question 4

What is the test for hydrogen

Answer 4

Place a lit split in a test tube if hydrogen is present it will make a squeaky pop

Question 5

What is the flame test used for

Answer 5

To find out what are the positive metal ions

Question 6

How do you carry out the flame test and what are the results

Answer 6

1)First clean the metal loop with a blue Bunsen burner flame and HCL
2) dip the clean loop into one of the test solutions and observe the colour

If it is:
Orange/red - Ca2+
Yellow- Na+
K+ - lilac
Blue/green - cu2+
Red- Li+

Question 7

What is the halide test used for

Answer 7

Identifying halide anions

(chloride, bromide, iodide)

Question 8

How do you carry out the halide test and what are the results

Answer 8

First add a few drops of nitric acid into the halide solution and shake the test tube gently.
Then add a few drops of silver nitrate solution and record your results

The observation:
If the precipitate colour is yellow iodide is present
If the precipitate colour is cream bromide is present
If the precipitate colour is white chloride is present

Question 9

How do you carry out the sulphate ions test?

Answer 9

Add a few drops of HCl to the sulphate solution, then shake the test tube gently. Then add a few drops of barium chloride solution and record your results.

The observation:
If sulphate ions are present, the precipitate colour should be white

Question 10

How do you carry out the carbonate test?

Answer 10

Add a few drops of any acid to the carbonate solution, then gently shake the test tube. Pastor gas formed three lime water to confirm its carbon dioxide.

The observation:
Effervescence

Question 11

What is the experiment for the precipitate reactions?

Answer 11

Add to sodium hydroxide to the sample solution

The observation:
Aluminium should turn a white precipitate
Calcium should turn the white precipitate
Magnesium should turn a white precipitate
Copper should be a blue precipitate
Iron (11) should be a green precipitate
Iron (111) should we are brown precipitate