Chemical Forums

Chemistry Forums for Students => Undergraduate General Chemistry Forum => Topic started by: nicholasbellono on September 28, 2007, 02:26:20 PM

Title: balancing equations- colors?
Post by: nicholasbellono on September 28, 2007, 02:26:20 PM

Balance equations:
Aqueous solutions of Cu(NO3)2, Na2CO3 are mixed and produce a blue precipitate of CuCO3.

I wrote Cu(NO3)2 + Na2CO3 --> 2CuCO3
What does the blue mean and how should i express that?
or am I right with what I have?

Another balancing equation has to deal with neutralization:
aqeous solutions of NaOH and H2SO4 are mixed. The neutralization of water is formed with the evolution of heat.

How do I go about balacing this one?

Title: Re: balancing equations- colors?
Post by: Borek on September 28, 2007, 02:40:04 PM

Quote from: nicholasbellono on September 28, 2007, 02:26:20 PM

Cu(NO3)2 + Na2CO3 --> 2CuCO3

What happened to Na⁺ and NO₃^-?

Title: Re: balancing equations- colors?
Post by: nicholasbellono on September 28, 2007, 05:17:53 PM

i don't know. I guess that is what I'm asking. where does it go

Title: Re: balancing equations- colors?
Post by: Borek on September 28, 2007, 05:31:40 PM

Let's see... sodium and nitrate... sodium nitrate?

Title: Re: balancing equations- colors?
Post by: nicholasbellono on September 28, 2007, 05:41:44 PM

I know what sodium and nitrate make. But what does the blue mean?
does it have an significance to my equation.
Here is what I have down right now:
Cu(NO3)2+ Na2CO3 ---> CuCO3 + Na2(NO3)2

Then for NaOH and H2SO4:
NaOH + H2SO4 ---> Na2SO4 + H20

Thanks for the help-

Am i on the right track?

Title: Re: balancing equations- colors?
Post by: Borek on September 28, 2007, 06:05:05 PM

Quote from: nicholasbellono on September 28, 2007, 05:41:44 PM

I know what sodium and nitrate make. But what does the blue mean?

Precipate was blue, you don't put it in the reaction equation, you should write in down in the observations done during experiment.

Quote

Cu(NO3)2+ Na2CO3 ---> CuCO3 + Na2(NO3)2

Better, although sodium nitrate formula looks different.

Quote

NaOH + H2SO4 ---> Na2SO4 + H20

That's correct skeletal equation. Don't forget to balance it :)

Title: Re: balancing equations- colors?
Post by: nicholasbellono on September 30, 2007, 04:09:51 PM

thanks!
here is what i came up with now:

2NaOH + H2SO4 --> Na2SO4 + 2H20

and

Cu(NO3) + Na2CO3 --> CuCO3 + 2NaNO3

Title: Re: balancing equations- colors?
Post by: Borek on September 30, 2007, 04:13:28 PM

Seems OK  :)

Title: Re: balancing equations- colors?
Post by: nicholasbellono on September 30, 2007, 04:23:42 PM

Borek- thanks for the help. I really appreciate it.