Vikascoder
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What was it formed copper(II) hydroxide+acetylene
Hello everybody recently i made copper(II) hydroxide and dissolved in water it was almost sitting at the base of beaker and it was green in colour
then i bubbled acetylene into it .the colour of the solution got black from green. I filtrated the solution and got black precipitate . Then i dried
it in sun and tried to ignite to check whether it was cupric acetylide but it didnt burn . I want to ask what was it formed.
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Brominator
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Could this not simply be the decomposition of copper (ll) hydroxide in to copper (ll) oxide and the acetylene had nothing to do with the reaction.
also how did u dissolve it in water as isn't copper hydroxide nearly insoluble in water?
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bbartlog
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| Quote: | | i made copper(II) hydroxide and dissolved in water it was almost sitting at the base of beaker and it was green in colour |
If A) it was green and B) you dissolved it in water, then the first problem seems to be that you don't have copper(II) hydroxide. That would be an
insoluble blue substance.
However, assuming that you mostly did have cupric hydroxide, then Brominator is probably right. It decomposes easily to CuO.
The less you bet, the more you lose when you win.
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weiming1998
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I agree with the previous two posts. Cu(OH)2 is extremely unstable, to the point that it will spontaneously decompose to black CuO at room temperature
(as I observed once). The synthesis of copper acetylide, as described http://en.wikipedia.org/wiki/Copper(I)_acetylide, is by passing acetylene gas
through a suspension cuprous chloride with water in the presence of ammonia (or is the solution itself liquid ammonia?). Cuprous chloride might be
made from the reduction of CuCl2 with ascorbic acid (vitamin C), found in health stores. `
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Vikascoder
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ya it was completely insoluble sitting at the base of beaker . i unintentionally passed acteylene into it .solution appeared to be green as i was
swirling it all around. copper hydroxide is almost insoluble in water. so this process can be used to make copper (II) oxide
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weiming1998
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Quote: Originally posted by Vikascoder  | | ya it was completely insoluble sitting at the base of beaker . i unintentionally passed acteylene into it .solution appeared to be green as i was
swirling it all around. copper hydroxide is almost insoluble in water. so this process can be used to make copper (II) oxide |
Of course! Either decomposing Cu(OH)2 or CuCO3 (which will also decompose in boiling water) will make CuO.
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