What is this setup called?
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?
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?
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
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.
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?
So are you saying that this setup is good to calculate the amount of H2 and H2O? Also what does the second drying tube
Yes, there are several hydrates with different numbers of hydration waters, CaCl2⋅2H2O, CaCl2⋅2H4O and CaCl2⋅6H2O.
Hydrogen? No. But you can easily check how much oxygen was lost from the CuO and how much water was produced in this process.
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?
Yes, that's exactly what it does.
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