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Chemistry Forums for Students => Inorganic Chemistry Forum => Topic started by: _cheers on February 16, 2009, 12:13:58 AM

Title: Lab help pls!
Post by: _cheers on February 16, 2009, 12:13:58 AM
I have 3 reactions and have to show a balanced equation for the overall reaction. I'm not sure on the rest of the products. One reaction carries into the next...
1) CuSO45H2O + H2O ---> [Cu(H2O)6]+2 + ?
2)[Cu(H2O6]+2 + 4NH3--->[Cu(NH3)4(H2O)2]2+  + HEAT + ?
3)[Cu(NH3)4(H2O)2]2+ + C2H5OH ----> Cu(NH3)4SO4H2O + ? --------> precipitate

And for the last reaction I added the mixture to ethanol...why?

thanks!!
Title: Re: Lab help pls!
Post by: expert on February 25, 2009, 01:27:31 AM
I wish I could help you, but the reactions don't make sense. What are you trying to achieve?
Title: Re: Lab help pls!
Post by: Arkcon on February 25, 2009, 08:00:21 AM
OK, there are some things you can do, right now, to make the work clearer for yourself, and anyone else. 

Copper Sulfate is usually used as the heptahydrate, the pretty blue solid, that's true.  But the %H2O is located within the crystal lattice.  When you dissolve it in an abundance of water, it doesn't matter.  So write your reactants without it.

Your first reaction is for the hydration of the Cu ion in water.  OK, if you think you need it, fine.  But I don't think you do.  I don't even know how Cu ions associate with water in solution, you'll have to use the same reference for sulfate anion, which is missing as a product in the first reaction.

It appears you're making copper sulfate ammonium complex, and precipiating it with ethanol.  Maybe you can search your book a bit on co-ordination compounds, and you can see what you're supposed to write.

Beyond that, the usual applies, get the same atoms on each side, in the same amounts, in combonations that make sense.
Title: Re: Lab help pls!
Post by: Borek on February 25, 2009, 09:28:32 AM
Quote from: Arkcon on February 25, 2009, 08:00:21 AM
Copper Sulfate is usually used as the heptahydrate

Penta
Title: Re: Lab help pls!
Post by: Arkcon on March 01, 2009, 03:59:40 PM
Quote from: Borek on February 25, 2009, 09:28:32 AM
Quote from: Arkcon on February 25, 2009, 08:00:21 AM
Copper Sulfate is usually used as the heptahydrate

Penta

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