Reactions of aqua ions

Question 1

What will you see if NaOH is added to [Fe(H20)6]2+?

Answer 1

Green precipitate forms - [Fe(H20)4(OH)2]

Question 2

What will you see if NaOH is added to [Fe(H20)6]3+?

Answer 2

Brown precipitate forms - [Fe(H20)3(OH)3]

Question 3

What will you see if NaOH is added to [Cu(H20)6]2+?

Answer 3

Blue precipitate forms - [Cu(H20)3(OH)3]

Question 4

What will you see if NH3 is added to [Fe(H20)6]2+?

Answer 4

Green precipitate forms - [Fe(H20)4(OH)2]

Question 5

What will you see if NH3 is added to [Fe(H20)6]3+?

Answer 5

Brown precipitate forms - [Fe(H20)3(OH)3]

Question 6

What will you see if NH3 is added to [Cu(H20)6]2+?

Answer 6

Blue precipitate forms - [Cu(H20)4(OH)2]

In excess deep blue solution [Cu(H20)2(NH3)4]2+

Question 7

What will you see if Na2CO3 is added to [Fe(H20)6]2+ or [Cu(H20)6]2+?

Answer 7

Green precipitate forms - FeCO3

Blue-green precipitate forms - CuCO3

Question 8

What will you see if Na2CO3 is added to [Fe(H20)6]3+?

Answer 8

Brown precipitate and bubbles of gas - Fe(H2O)3(OH3)

Question 9

What solution and product do you see if you add conc HCL to aqueous Fe3+, Fe2+, and Cu2+?

Answer 9

Fe3+ - yellow solution [FeCl4]-
Fe2+ - yellow solution [FeCl4]2-
Cu2+ - green solution [CuCl4]2-