How do you write a net ionic reaction?

Question

I need help with any one of these:

1. Ammonium sulfate solution reacts with barium nitrate solution

2. Zinc metal is added to a solution of copper (II) chloride.

3. Propane gas (C3H8) is burned in excess oxygen.

4. Dinitrogen pentoxide gas is added to distilled water.

5. Solid calcium chlorate is heated strongly.

6. Sodium hydroxide solution is added to a solution of iron (III) bromide.

7. Chlorine gas is bubbled through a solution of sodium bromide.

8. Solutions of lead(II) nitrate and calcium iodide are combined.

9. Sulfuric acid is combined with solid magnesium hydroxide.

10. Solid barium oxide is added to distilled water.

11. Isopropyl alcohol (C3H7OH) is burned in air.

12. Iron metal shavings are added to hydrochloric acid.

13. Solid sodium carbonate is heated in a crucible.

14. Solid aluminum hydroxide is added to perchloric acid.

15. Sodium metal is added to distilled water.

thx

Answer 1

Here is the first one:

Write the total equation

(NH4)2SO4  +  Ba(NO3)2  =  BaSO4  +  NH4NO3

Balance

(NH4)2SO4  +  Ba(NO3)2  =  BaSO4  +  2NH4NO3

Now break up the compounds based on solubility rules, or use the original state of the material.  For example in #14 Al(OH)3 appears as the solid in the equation.

2(NH4+) + SO4(-2)  +  Ba+2 + 2(NO3-)  =  BaSO4(s)  +  2NH4+ 2NO3-

All but BaSO4 are (aq)

Eliminate the like species that appear on both sides

SO4(-2)(aq)  +  Ba+2(aq) =  BaSO4(s)

that is your net ionic.

It will always depend on the formation of a solid, a gas, or a non-ionic species.  You can also have the breakup of a solid or the reaction of a gas.  Look for things produced or used that are not (aq).