Reactions of aqueous ions

Question 1

Observation and formula for iron II with NaOH

Answer 1

Green sol to green ppt that turns brown standing in air

Fe(H2O)4(OH)2 (s)

Question 2

Observation and formula of copper II with NaOH

Answer 2

Blue sol to blue ppt

Cu(H2O)4(OH)2 (s)

Question 3

Observation and formula of iron III with NaOH

Answer 3

Purple solution to orange - brown ppt

Fe(H2O)3(OH)3 (s)

Question 4

Observation and formula of aluminum III with NaOH

Answer 4

Colourless sol to white ppt

Al(H2O)3(OH)3 (s)

Question 5

Action of excess NaOH on iron II, copper II and iron II

Answer 5

No further change

Question 6

Formula and observation of Aluminum III with excess NaOH

Answer 6

Colourless sol to white ppt to colourless sol

[Al(OH)4(H2O)2]^- (aq)

Question 7

Observation and formula for iron II with NH3

Answer 7

Green sol to green ppt

Fe(H2O)4(OH)2 (s)

Question 8

Observation and formula for Copper II with NH3

Answer 8

Blue sol to blue ppt

Cu(H2O)4(OH)2 (s)

Question 9

Observation and formula for iron III with NH3

Answer 9

Purple sol to orange - brown ppt

Fe(H2O)3(OH)3 (s)

Question 10

Observation and formula for Aluminum III with NH3

Answer 10

Colourless sol to white ppt

Al(H2O)3(OH)3 (s)

Question 11

Action of excess NH3 on iron II, Iron III and aluminium III

Answer 11

No further change

Question 12

Observation and formula of excess NH3 on copper II

Answer 12

Blue sol to deep blue sol

[Cu(H2O)2(NH3)4]^2+

Question 13

Observation and formula of iron II on Na2CO3

Answer 13

Green sol to green ppt

FeCO3 (s)

Question 14

Observation and formula of copper II on Na2CO3

Answer 14

Blue sol to blue-green ppt

CuCO3 (s)

Question 15

Observation and formula of iron III on Na2CO3

Answer 15

Purple sol to orange-brown ppt + CO2

Fe(H20)3(OH)3 (s)

Question 16

Observation and formula of aluminium III with Na2CO3

Answer 16

Colourless sol to white ppt + CO2

Al(H2O)3(OH)3 (s)