Experiment 6- Chemical Reactions of Copper and Percent Yield

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1

What is the purpose of Experiment 6?

Familiarize w/ basic lab procedures,

some chemistry of a typical transition element

and the concept of % yield.

2

What do most chemical syntheses involve?

the separation and purification of a desired product from unwanted contaminants.

3

With which reactions will you become acquainted?

Redox and metathesis

4

What is this experiment designed to do?

to be quantitative evaluation of your individual lab skills in

carrying out some of these operations

5

What will you do by means of these reactions?

Carry out several chemical transformations involving

Cu and its compounds

6

What will you do finally?

Recover the copper sample with maximum efficiency

7

What will be the chemical reactions involved? (6 total)

RuM DiMeRR

1. Cu + HNO3 --> Cu(NO3)2 + NO2 + H2O Redox

2. Cu(NO3)2 + NaOH --> Cu(OH)2 + 2 NaNO3

3. Cu(OH)2 --> CuO + H2O

4. CuO + H2SO4 --> CuSO4 + H2O

5. CuSO4 + Zn --> ZnSO4 + Cu

6. CuSO4 + Al --> Al2(SO4) + Cu

8

What does each of these reactions proceed to?

When do metathesis reactions proceed to completion?

completion

They proceed to completion whenever one of the products is removed from the solution (like in the formation of a gas or an insoluble substance)

9

Which reactions proceed to completion in a metathesis reaction?

Describe how

1, 2, 3

1 and 3 gas forms

2 and insoluble precipitate forms

10

What happens with reactions 5 and 6?

They proceed to completion b/c copper is more difficult to oxidize than either Zn or Al

11

What is the object of the experiment?

To recover all the copper w/ wh/ you began= test of your lab skills

12

How do you express % yield of copper?

as the ratio of the recovered mass to initial mass of Cu

% yield= recovered mass Cu/

initial mass Cu


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