required practical 11 - testing aqueous transition metal ions

Question 1

test 1a - testing ions using sodium hydroxide

Answer 1

add 10 drops of solution 1 to test tube, add sodium hydroxide and shake
repeat with solution 2 and 3

Question 2

test 1b - testing ions using boiling water

Answer 2

fill beaker with boiling water
add test tubes from test 1a (NaOH test)
wait for 10 minutes

Question 3

test 2 - test with sodium carbonate

Answer 3

add 10 drops of sodium carbonate to test tube
add solution 1 and shake
repeat with solution 2 and 3

Question 4

test 3 - test with silver nitrate

Answer 4

add 10 drops of solution 1 to test tube
add 10 drops of silver nitrate
repeat with solution 2 and 3
wait for 10 minutes

Question 5

results of test 1 (NaOH) with iron, copper, iron 3 and aluminium

Answer 5

iron 2 - green -> green
copper - blue sol -> blue ppt
iron 3 - purple sol -> brown ppt
aluminium - colourless -> white ppt

Question 6

results of test 2 (Na2CO3) with iron, copper, iron 3 and aluminium

Answer 6

iron 2 - green sol -> green ppt
copper - blue sol -> blue ppt
iron 3 - purple sol -> brown ppt
aluminium - colourless -> white ppt and CO2 gas

Question 7

results of test 3 (AgNO3) with iron, copper, iron 3 and aluminium

Answer 7

iron 2 - green sol -> green ppt
copper - blue sol -> blue ppt
iron 3 - purple sol -> brown ppt
aluminium -colourless sol -> white ppt

Question 8

reaction of ions with excess NaOH

Answer 8

Fe 2, Cu, Fe 3 = no change
Al - white ppt -> colourless sol

Question 9

reactions of ion with excess NH3

Answer 9

Fe2, Fe3, Al = no change
Cu - blue ppt -> darker blue sol