Transition metal colours

Question 1

Copper 2 with NaOH

Answer 1

blue solution forms pale blue precipitate.
doesn’t dissolve in excess NaOH

Question 2

copper 2 with ammonia solution

Answer 2

blue solution from dark blue precipitate
dissolves in excess ammonia to form dark blue solution

Question 3

iron 2 with NaOH

Answer 3

pale green solution forms green precipitate turning rusty brown when standing in air
doesn’t dissolve in excess NaOH

Question 4

iron 2 with ammonia solution

Answer 4

pale green solution from green ppt turning rusty brown when standing in air
doesn’t dissolve in excess ammonia solution

Question 5

iron 3 with NaOH

Answer 5

yellow solution forms a rusty brown ppt when standing in air
doesn’t dissolve in excess NaOH

Question 6

iron 3 with ammonia solution

Answer 6

yellow solution forms rusty brown ppt when standing in air
doesn’t dissolve in excess ammonia solution

Question 7

chromium 3 with NaOH

Answer 7

violet solution forms grey green ppt
dissolves in excess NaOH to from green solution

Question 8

chromium 3 with ammonia solution

Answer 8

violet solution form green ppt
dissolves in ammonia solution to form purple solution

Question 9

cobalt 2 with NaOH

Answer 9

pink solution forms a blue ppt turning beige when standing in air
doesn’t dissolve in excess NaOH

Question 10

cobalt 2 with ammonia solution

Answer 10

pink solution from blue green ppt
dissolves in excess ammonia solution to form light brown solution

Question 11

zinc 2 with NaOH

Answer 11

colourless forms white ppt
dissolve in excess NaOH

Question 12

zinc 2 with ammonia solution

Answer 12

colourless forms white ppt
dissolve in excess ammonia solution

Question 13

cobalt with hcl

Answer 13

pink to dark blue

Question 14

copper 2 with hcl

Answer 14

light blue to green