Sodium Hydroxide Test

Question 1

What is the colour of precipitate when Calcium/Ca2+ is added to sodium hydroxide solution.

Answer 1

White in Sodium Hydroxide Solution

Question 2

What is the colour of precipitate when Magnesium/Mg2+ is added to sodium hydroxide solution.

Answer 2

White in Sodium Hydroxide Solution

Question 3

What is the colour of precipitate when Aluminium/Al 3+ is added to sodium hydroxide solution.

Answer 3

White - dissolves in excess sodium hydroxide

Question 4

What is the colour of precipitate when Copper/ Cu2+ is added to sodium hydroxide solution.

Answer 4

Blue in Sodium Hydroxide Solution

Question 5

What is the colour of precipitate when Iron Fe2+ is added to sodium hydroxide solution.

Answer 5

Green - gradually turns brown, if touches air.

Question 6

What is the colour of precipitate when Iron/Fe 3+ is added to sodium hydroxide solution.

Answer 6

Brown

Question 7

Which 2 metal ions are white, when added to sodium hydroxide solution?

Answer 7

Calcium/Ca2+ and Magnesium/Mg2+

Question 8

Which metal ion are white, then dissolves in excess sodium hydroxide, when added to sodium hydroxide solution?

Answer 8

Aluminium/Al3+

Question 9

Which metal ion are blue, when added to sodium hydroxide solutioin

Answer 9

Copper/Cu2+

Question 10

Which metal ion are green–gradually** turns brown** if touches air, when added to sodium hydroxide solution

Answer 10

Iron/Fe2+

Question 11

Which metal ion are brown, when added to sodium hydroxide solution

Answer 11

Iron/Fe3+