Transition metals (precipitation, ions etc.)

Question 1

equations of Fe2+(aq) with NaOH, and of Fe2+(aq) and NH3.

Answer 1

Question 2

equations of Cu2+(aq) with NaOH, and of Cu2+(aq) and ammonia

Answer 2

Question 3

equations of Mn2+(aq) with NaOH, and of Mn2+(aq) with ammonia

Answer 3

Question 4

equations of Fe3+(aq) with ammonia, and of Fe3+(aq) with NaOH

Answer 4

Question 5

equations of Cr3+(aq) with NaOH, and of Cr3+(aq) with NH3

Answer 5

Question 6

colour of aqueous Fe2+ ions

Answer 6

pale green

Question 7

colour of aqueous Cu2+ ions

Answer 7

pale blue

Question 8

colour of aqueous Mn2+ ions

Answer 8

pale pink

Question 9

colour of aqueous Fe3+ ions

Answer 9

yellow

Question 10

colour of aqueous Cr3+ ions

Answer 10

green

Question 11

precipitation colour change of Fe2+

Answer 11

pale green -> green precipitate (darkens o standing)

Question 12

precipitation colour change of Cu2+

Answer 12

pale blue -> blue precipitate

Question 13

precipitation colour change of Mn2+

Answer 13

pale pink -> pink precipitate (darkens on standing)

Question 14

precipitation colour change of Fe3+

Answer 14

yellow -> orange precipitate ( darkens on standing)

Question 15

precipitation colour change of Cr3+

Answer 15

green -> grey-green precipitate

Question 16

which transition metal precipitates react further in exess NH3?

Answer 16

-copper hydroxide (blue ppt to dark blue solution)
-Chromium hydroxide (grey-green ppt to purple solution)

Question 17

which transition metal precipitates react further in exess NaOH?

Answer 17

-Chromium oxide (grey-green ppt to dark green solution)