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Predicting Chemical Equations

Asked Feb 24, 2007, 01:09 PM — 4 Answers
So I am having trouble with my chemistry.

What I don't understand is what to do when you are predicting the products of a chemical equation, and knowing what its physical state is

For example

Hg (NO3)2 + Na2S -->

I looked at my activity series and Sodium is more reactive than Mercury so I got

Na(NO3) + HgS

Then balanced the equation would look like

Hg(NO3)2 + Na2S --> 2Na(NO3) + HgS


So is that right?

Am I going in the right direction?

But how do you find out its physical state?

Any help would be wonderful!

Here is another

H2S04 + Ca(NO3)2 --> ?

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4 Answers
Evil dead's Avatar
Evil dead Posts: 120, Reputation: 10
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#2

Feb 25, 2007, 11:49 AM
Hg(NO3)2 + 2NaS --> 2Na(NO3) + Hg2S

Should be the correct balanced equation, though I did a fast job so it might be wrong. Hg is a transition metal so I'm a bit uncertain of the common valence.

But you are on the right track, predicting a chemical reaction is easy, most usually consist of acid base.
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lefty584's Avatar
lefty584 Posts: 2, Reputation: 1
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#3

Feb 25, 2007, 06:52 PM
Thanks!
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pwd77's Avatar
pwd77 Posts: 174, Reputation: 10
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#4

Feb 25, 2007, 07:21 PM
There are general physical properties of many chemicals which allow an educated guess, but often it is easiest to go to a reference source to find out the physical property of products in a reaction.

In this case soluble (aq = aqueous solution) reactants form insoluble (s = solid) products:

Hg(NO3)2 (aq) + Na2S (aq)-->2Na(NO3) (aq) + HgS (s)

H2S04 (aq)+ Ca(NO3)2 (aq)--> CaSO4(s) + H2NO3(aq)
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hot sexy gurl's Avatar
hot sexy gurl Posts: 5, Reputation: 1
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#5

Dec 9, 2007, 11:48 AM
Help me to do this work balance molecular equations?

___ Fe + ____ S --> ___ FeS
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