Transition Metal Precipitates

Write the formula,state and colour of the product of Cu + NaOH

Blue gelatinous precipitate, Cu(OH)2

What colour is Cu2+ solution

Blue

When do you NOT get a blue gelatinous precipitate with Cu2+, what products do you get instead?

-Addition of excess ammonia

-Deep Blue Solution

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

What acid do ALL ppt dissolve in

H2SO4

What colour is Fe2+ solution

Pale Green

What colour is Fe2+ and NaOH reaction, what is the product

• Green gelatinous ppt

• Fe(OH)2

What colour will Fe(OH)2 turn if left out in the air

Orange

What is the product of Fe2+ + NH3

Fe(OH)2

What is the colour of Fe3+ solution

Orange

What is the product of Fe2+ plus ammonia

Fe(OH)2

What is the colour and formula of the product of Cr3+ and a small amount of NaOH

Green gelatinous ppt.

Cr(OH)3

What colour is Cr3+ solution?

Green

What is the formula and colour of the product when Cr3+ and excess NaOH are reacted

-Dark Green Solution

-[Cr(OH)6]3-

What is the formula and colour of the product of Cr3+ + a small amount of ammonia

• Cr(OH)3

• Green gelatinous ppt.

What is the formula and colour of the product from the reaction of Cr3+ + excess ammonia

• Purple/Pink solution

• [Cr(NH3)6]3+

What colour is Mn2+ solution

Pale pink

What product do you get when you react Mn2+ with excess ammonia or excess NaOH

• Brown gelatinous ppt that darkens

• Mn(OH)2