Identifying Net Ionic Equations for Reactions

[trossi]

Homework Statement

For each of the following situations, identify those for which a reaction is liely to occur. For those that do occur, write a net ionic equation

a) Chromium dipped into silver nitrate.
b) B) Gold immersed in hydrochloric acid.
c) Nickel pellets dropped into calcium acetate, Ca(C2H3O2)2.
d) Aluminum dropped into a bath of sulphuric acid.
e) Zinc dipped into a solution of lead (II) nitrate.

Homework Equations

solubility charts

The Attempt at a Solution

I can't really figure out how to form a net ionic equation or how to get the charge but here is my attempt so far
a) Cr(s) + 2 AgNO3(aq) -> Cr(NO3)2(aq) + 2 Ag(s)
b) Au(s) + HCl(aq) -> no reaction
c) Ni(s) + Ca(C2H3O2)2(aq) -> no reaction
d) 2 Al(s) + 3H2SO4(aq) -> Al2(SO4)3 + 3 H2
e) Zn(s) + Pb(NO3)2(aq) -> Zn(NO3)2(aq) + Pb(s)

if anyone can look over this i'd really appreciate it

 

[trossi]

i attempted to form the net ionic equations I'm just still not sure if this is correct.

a) Chromium dipped into silver nitrate.
Cr(s) + 2 AgNO3(aq) -> Cr(NO3)2 (aq) + 2 Ag(s)
Therefore the net ionic equation is
Cr(s)+2 + Ag(aq)+ -> Cr(aq)+2 + Ag(s)+
b) Gold immersed in hydrochloric acid.
Au(s) + HCl(aq)-> no reaction
c) Nickel pellets dropped into calcium acetate, Ca(C2H3O2)2.
Ni(s) + Ca(C2H3O2)2 -> no reaction
d) Aluminum dropped into a bath of sulphuric acid.
2 Al(s) + 3 H2SO4(aq) -> Al2(SO4)3 + 3 H2
Therefore the net ionic equation is
2Al(s)+3 + H2(aq)+ -> Al2(aq)+3 + H2(g)+
e) Zinc dipped into a solution of lead (II) nitrate.
Zn(s) + Pb(NO3)2(aq) -> Zn(NO3)2(aq) + Pb(s)
Therefore the net ionic equation is
Zn(s)+2 + Pb(aq)+2 -> Zn(aq)+2 + Pb(s)+2

 

[Blueshift5]

!

Your attempt at writing net ionic equations is correct. The key to identifying the net ionic equation is to first determine the states of the reactants and products (solid, liquid, gas, aqueous) and then use the solubility rules to determine which compounds will dissociate into ions in solution. The net ionic equation only includes the species that are involved in the reaction and excludes any spectator ions that do not participate in the reaction.

a) The net ionic equation for this reaction is: Cr(s) + 2 Ag+(aq) -> Cr2+(aq) + 2 Ag(s)
b) The net ionic equation for this reaction is: Au(s) + 3 H+(aq) -> no reaction (gold is a noble metal and does not react with hydrochloric acid)
c) The net ionic equation for this reaction is: no reaction (both nickel and calcium acetate are soluble in water and do not form any insoluble compounds)
d) The net ionic equation for this reaction is: 2 Al(s) + 3 H+(aq) -> 2 Al3+(aq) + 3 H2(g)
e) The net ionic equation for this reaction is: Zn(s) + Pb2+(aq) -> Zn2+(aq) + Pb(s)

Keep in mind that the net ionic equation is only applicable to reactions that occur in aqueous solutions. For reactions involving solid or gaseous reactants, the net ionic equation may not be applicable. Also, make sure to double check the solubility rules to determine if a compound is soluble or insoluble in water. Good job on your attempt!