Experiment C: Compounds Of Copper

Question 0

What does the reaction with copper and nitric acid form?

Answer 0

Water soluble copper(II) nitrate

Question 1

Copper does not react readily with sulfuric or hydrochloric acids, what does it react with?

Answer 1

Nitric acid (HNO3)
It is a strong oxidizing agent

Question 2

Which oxidation state of copper is more stable?

Answer 2

The +2 oxidation state (rather than the +1)

Question 3

Describe the traditional copper cycle

Answer 3

Cu->Cu(NO3)2->CuCO3->CuSO4

Question 4

What are the products of the reaction between nitric acid and copper metal?

Answer 4

Copper (II) nitrate
Nitrogen monoxide/ nitric oxide (NO) -colourless gas
Water

Question 5

What happens to Nitrogen monoxide when it reacts with oxygen

Answer 5

The colourless NO reacts immediately with oxygen to form the poisonous reddish brown NO2 (nitrogen dioxide)

Question 6

How do we modify the traditional copper cycle experiment?

Answer 6

We begin with Cu(NO3)2x2.5H2O(s) to prepare aqueous Cu(NO3)2. We add sodium carbonate (Na2CO3) to cause a CuCO3 precipitate. It is then reacted with sulfuric acid to form CuSO4

Question 7

Is copper carbonate soluble?

Answer 7

No it precipitates in aqueous solution

Question 8

In water NH3(aq) acts as a

Answer 8

Weak base

Question 9

Small amounts of aqueous ammonia added to copper (II) sulfate leads to the formation of ____. Large amounts leads to ____.

Answer 9

1) light blue Cu(OH)2(s)

2) dark blue complex ion Cu(NH3)4+2(aq)

Question 10

Copper can be recovered through the following reaction:

Answer 10

The oxidation-reduction reaction between zinc and copper

Zn(s)+Cu+2–>Zn+2 + Cu(s)