What is the Setup Called that Collects Water from the Cu Reduction Process?

[TT0]

What is this setup called?

 

[Bystander]

Hydrogen generator.

 

[TT0]

I can't seem to find hydrogen generator on wikipedia or other chemistry sites. Could you direct me to a link or tell me how it works?

 

[Borek]

Actually this is more complicated, hydrogen generator is just a part of the setup, and I doubt this particular setup has any particular name.

Can you try to guess what are reactions taking place in the flask, in the tube with CuO sample and in the drying tubes?

 

[TT0]

In the flask:
Zn + 2HCl -> ZnCl2 + H2

In the drying tube:
I am not sure - maybe something to do with the water vapour?

In the CuO sample:
H2 + CuO -> Cu + H2O

 

[Borek]

In the drying tube:
I am not sure - maybe something to do with the water vapour?

Yes, water is captured by CaCl₂ as hydration water. And (that's one of the most important things in this experiment) mass of CaCl₂ changes. You can easily check by how much it changed, you can also easily check by how much mass of CuO changed during reduction. That gives a nice starting point for many stoichiometry experiments.

 

[TT0]

I can't think of any equations for hydration of CaCl₂, could you give me some hints? Or does it create one of these things: CaCl₂.H₂O?

That gives a nice starting point for many stoichiometry experiments.

So are you saying that this setup is good to calculate the amount of H₂ and H₂O? Also what does the second drying tube

 

[Borek]

does it create one of these things: CaCl₂.H₂O?

Yes, there are several hydrates with different numbers of hydration waters, CaCl₂⋅2H₂O, CaCl₂⋅2H₄O and CaCl₂⋅6H₂O.

So are you saying that this setup is good to calculate the amount of H₂ and H₂O?

Hydrogen? No. But you can easily check how much oxygen was lost from the CuO and how much water was produced in this process.

Also what does the second drying tube

Its mass change during the experiment - why?

 

[TT0]

Also what does the second drying tube

Its mass change during the experiment - why?

I didn't finished typing it seems. What I meant was what does the second drying tube do? Does it just collect water from the Cu reduction process?

 

[Borek]

Does it just collect water from the Cu reduction process?

Yes, that's exactly what it does.