Identifying Cations Using Sodium Hydroxide Solution

Question 1

Step 1: Dissolve …?… in some water.

Answer 1

Step 1: Dissolve ONE SPATULA OF THE SALT in some water.

Question 2

Step 2: Place …?… in a test tube.

Answer 2

Step 2: Place 10cm^3 OF THE SOLUTION in a test tube.

Question 3

Step 3: Add …?… drop by drop.

Answer 3

Step 3: Add SODIUM HYDROXIDE SOLUTION drop by drop.

Question 4

Step 4: Observe the …?…, if one is produced

Answer 4

Step 4: Observe the COLOUR OF THE PRECIPITATE, if one is produced.

Question 5

Step 5: For any …?…, continue to add sodium hydroxide solution, drop by drop.

Answer 5

Step 5: For any WHITE PRECIPITATE PRODUCED, continue to add sodium hydroxide solution, drop by drop.

Question 6

Step 6: Observe what happens to the …?…

Answer 6

Step 6: Observe what happens to the PRECIPITATE.

Question 7

What colour of precipitate does Magnesium Chloride produce?

Answer 7

White

Question 8

What colour of precipitate does Aluminium Chloride produce?

Answer 8

White

Question 9

What colour of precipitate does Zinc (II) Chloride produce?

Answer 9

White

Question 10

What colour of precipitate does Copper (II) Chloride produce?

Answer 10

Blue

Question 11

What colour of precipitate does Iron (II) Chloride produce?

Answer 11

Green

Question 12

What colour of precipitate does Iron (III) Chloride produce?

Answer 12

Red-brown

Question 13

Does Magnesium Chloride’s precipitate redissolve in excess sodium hydroxide?

Answer 13

No

Question 14

Does Aluminium Chloride’s precipitate redissolve in excess sodium hydroxide?

Answer 14

Yes

Question 15

Does Zinc (II) Chloride’s precipitate redissolve in excess sodium hydroxide?

Answer 15

Yes

Question 16

Does Copper (II) Chloride’s precipitate redissolve in excess sodium hydroxide?

Answer 16

No

Question 17

Does Iron (II) Chloride’s precipitate redissolve in excess sodium hydroxide?

Answer 17

No

Question 18

Does Iron (III) Chloride’s precipitate redissolve in excess sodium hydroxide?

Answer 18

No