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Moles of Iron and Copper Lab

Can someone please verify my results? and help me in one-2 questions?

I did this lab in school today and had some problems filling in the table that followed.
In the lab, we took some Copper Chloride and mixed it dionized water. Then we added in an iron nail and waited for about 20 mins. After 20 mins we decanted the water(threw it away) and were left with copper+a lil bit of water which was later dried.
The following is the data I have

Mass of Beaker --> 0.906
Mass of Beaker and Copper Chloride --> 12.44
Mass of Nail before reaction-->1.729
Mass of Nail after reaction-->1.444
Mass of Beaker and dry copper[dry]-->10.345

The questions that followed were to calculate moles and mass.

1>Mass of Copper formed.

For this,it should be 12.44-10.345 =2.095gms

2>Moles of Copper

For this I did 2.095/63.5= .329moles

3>Mass of Iron reacted
1.729-1.444=.285gms


4>Moles of Iron
.285/55.8=.005

5>Ratio of moles of Iron to Copper
_______________________________________________

I guess I screwed up on the calculations or something on the Mass of Iron Reacted which gave me .285 gms. This I feel has screwed my moles of Iron up. I dont know where I am going wrong in this.

If someone can help me out,I would be greatful. I am kinda guessing the mole ration should be 1:1.


Jen
 

Answers and Replies

Can Anyone atleast get me started? :cry:
 
???Anyone???
 
chemisttree
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Everything looks good, except that your calculation for mass of copper is actually the difference in the weight of copper chloride and formed copper. The answer is correct but that question was not asked.

All of your problems are solved if you can find a weigh to determine the mass of copper.

Copper chloride is not copper.
 
I messed up on the Mass of the beaker. it should read 9.906 above and not .906

In the end when we dried the copper from the dionized water,I massed it and got 10.345gms for copper.

The mole ration after calculation is a high number and not 1:1 or 2:3. I am sure something is wrong.
 
Last edited:
chemisttree
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Answer the first question!
 
First Question?

So copper should be =10.345-9.906-->.439gms
 
chemisttree
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Excellent!

Couple that answer with your obvious skill in problem-solving and you are done with this problem!

Now answer #2 and recalculate #5.
 
Borek
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