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Writing molecular,ionic and net ionic equations

Submitted by tfarnsley on Thu, 02/21/2013 - 14:28

Write a molecular, ionic and net ionic equations that decribe the reaction of aqueous lithium chloride and aqueous silver nitrate.

I think that Li , Cl , and N are all soluable and Ag is insoluable.

I don't think that it is a double displacement so I am not sure which elements will combine.  I think that it might be a precipitation reaction. 

I know that the ionic formula is just breaking apart all of the elements. The net ionic will be removeing the spectators. 


LiCl + Ag(NO3)  ------------> LiNO3  + AgCl

AgCl is insoluble and rest of other three ionic compounds soluble.

i have given you the molecular euqaiton now as you need  to  write the ionic and net ionic equation go to this tutorial and give this a try.

http://www.mychemistrytutor.com/tutorials/net-ionic-equation

also 

http://www.mychemistrytutor.com/downloads/general-solubity-rules-table


For the ionic equation, all you essentially have to do is break down all the soluble species into their respective ions. 

Here is the ionic equation:

Li+1 (aq) + Cl-1 (aq) + Ag+1 (aq) + NO3 -1(aq) --> AgCl (s) + Li+1 (aq) + NO3-1(aq)

Removing the spectator ions leaves us with the following net ionic equation:

Ag+1 (aq) + Cl-1 (aq) ---> AgCl(s)

 

These types of questions ultimately are testing your knoledge of solubility rules. Once you figure out the products in the equation by switching the cations with their respective anions in the reactants, all you have to do is determine which product is insoluble and in your net ionic equation show how that product was formed.

Here is a good general list of solubility rules for you to remember:

1.    Any NO3-, C2H3O2-, HCO3-, ClO3-, ClO4- salts are always soluble

2.    NH4+ salts are always soluble

3.    Salts of Group 1 metals (Li, Na, K etc) are always soluble

4.    Cl-, Br-, I- salts are soluble, except if they have Ag+, Hg2+2, and Pb+2

5.    SO4-2 salts are soluble except if they have Ag+, Hg2+2, Pb+2, Ca+2, Sr+2, Ba+2

6.    CO3-2, CrO4-2, C2O4-2, PO4-3 salts are are insoluble except when bonded to NH4+ or any group 1 metal

7.    S-2, OH- salts are insoluble except when bonded to NH4+, any group 1 metal, Ca+2, Sr+2, Ba+2

 

Hope this helps,

Michael Rosen

Author of "The Guide to Surviving General Chemistry"

www.survivechem.com