Precipitation Reactions Flashcards Preview

Chemistry > Precipitation Reactions > Flashcards

Flashcards in Precipitation Reactions Deck (20)
Loading flashcards...
1

Cu2+

Pale blue solution

2

Cu(OH)2

Blue precipitate

3

Fe2+

Pale green solution

4

Fe(OH)2

Green precipitate

5

What colour does the green Fe(OH)2 precipitate turn after standing in air?

Brown at its surface. Iron (II) is oxidised to iron (III). Fe(OH)2 -> Fe(OH)3

6

Fe3+

Pale yellow solution

7

Fe(OH)3

Orange-brown precipitate

8

Mn2+

Pale pink solution

9

Mn(OH)2

Light brown precipitate

10

Cr3+

Violet solution

11

Cr(OH)3

Green precipitate

12

Which hydroxides that you have studied do not dissolve in excess NaOH?

Cu2+, Fe2+, Fe3+, Mn2+

13

Which hydroxide does dissolve in excess NaOH?

Cr3+
Cr3+ -> Cr(OH)3 -> [Cr(OH)6]3-
Violet solution -> Green precipitate -> Dark green solution

14

Which hydroxides do not dissolve in excess NH3?

Fe2+, Fe3+, Mn2+

15

Which hydroxides do dissolve in excess NH3?

Cu2+, Cr3+

16

[Cr(OH)6]3-

Dark green solution

17

C2O72-

Orange

18

CrO42-

Yellow solution

19

CuI

White precipitate

20

Cr3+ (acidified)

Green solution (not violet)