Determining the precipitate in an equation.?

Question

Im looking at equations, and I need to figure out what the precipitates that are formed in each of them..

One of which is:
Pb(NO3)2+Na2CO3 --> PbCO3+2NaNO3

Could I get some advise on how to find out what turns out to be the precipitate, and what is the (aq)?

Thanks. I guess I was looking up the wrong thing, thanks for the help!

Answer 1

(aq) is the substances that exist as ions in an aqueous (water) solution - the water is the solvent

to find the precipitate, use the solubility rules, u can find them anywhere on the net just google em

there i think its PbCO3

Answer 2

Precipitate Equation

Answer 3

There are a series of rules that allow you to predict the solubilities of ionic compounds. Try looking at:
http://eppe.tripod.com/soluble.htm
for example. In the case above, the precipitate will be PbCO3 (a carbonate, which tend not to be soluble unless they have cations like Na+ or K+ with them). Nitrates and sodium salts tend to be soluble, so the NaNO3 will be the (aq) component.

Answer 4

There is no good way to "know" this. You must memorize the soluble and insoluble salts. PbCO3 is insoluble. It may be that there are tables in your book that will tell you.

Don't worry. It gets worse than this. Next you'll learn that the insoluble salts are really only "slightly soluble." You will carry out calculations of just how soluble they are.

Answer 5

Things that dissolve in water will be aqueous. Things that do not will form precipitates. You must memorize solubility rules.
These are simple guidelines for determining solubility.

1. All compounds with Na+, K+, NH4+ ions are soluble in water.
2. All nitrates (NO3-) and acetates (CH3COO-) are soluble in water.
3. Most chlorides (Cl-) and sulfates (SO42-) are soluble in water. Except the following: AgCl, PbCl2, Hg2Cl2, BaSO4 and PbSO4.
4. Most carbonates (CO32-), phosphates (PO43-), sulfides (S2-), and hydroxides (OH-) are insoluble in water. Exceptions are LiOH, NaOH, KOH and NH3 (aq).


So, substances like NaCl will be aqueous, and substances like Pb(OH)2 will not.

Answer 6

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