Module 11i Part W: Re-write Equations Ionically Non REDOX Answers

The following Rules are written at the top of the Part G test:

Show as ions: soluble salts (aq) and strong acids (aq); leave as molecules/formula units insoluble salts (s), weak acids (aq), covalent molecules. (Strong hydroxide bases are hydroxides which are also soluble salts are written ionically.)

 

 

Strong Acids are: Perchloric Acid; Hydrochloric Acid; Nitric Acid; Sulfuric Acid; Hydrobromic Acid; Hydroiodic Acid.

 

Strong Bases are: Sodium hydroxide, Potassium hydroxide, Calcium hydroxide, Barium hydroxide, Strontium hydroxide

 

Here are a set of worked examples:

 

1. KOH (aq) + HNO3(aq) KNO3(aq) + HOH(l)

 

Decide which compounds should be split into ions:

K|OH (aq) + H|NO3(aq) K|NO3(aq) + HOH(l)

Strong base strong acid soluble salt covalent molecule

 

Rewrite the ionic species as ions, and leave the rest as compound formulas:

K1+(aq)+OH1-(aq)+H1+(aq)+NO31-(aq)K1+(aq)+NO31-(aq)+HOH(l)

 

Cancel the Spectator Ions:

K1+(aq)+OH1-(aq)+H1+(aq)+NO31-(aq)K1+(aq)+NO31-(aq)+HOH(l)

 

 

Final Net Ionic Answer:
1. KOH (aq) + HNO3(aq) KNO3(aq) + HOH(l)

OH 1-(aq) + H 1+(aq) HOH (l)

------------------------------------------------------------------------------

2. CuSO4 (aq) + Na2CO3 (aq) CuCO3 (s) + Na2SO4 (aq)

Decide which compounds should be split into ions:

 

Cu|SO4 (aq) + Na2|CO3 (aq) CuCO3 (s) + Na2|SO4 (aq)

Soluble Salt Soluble Salt Insoluble salt Soluble Salt

 

 

 

Rewrite the ionic species as ions, and leave the rest as compound formulas

Cu2+(aq)+SO42-(aq)+2Na1+(aq)+CO32-(aq)

CuCO3(s) + 2Na1+(aq)+SO42-(aq)

 

 

Cancel the Spectator Ions:

Cu2+(aq)+SO42-(aq)+2Na1+(aq)+CO32-(aq)

CuCO3(s) + 2Na1+(aq)+SO42-(aq)

Final Net Ionic Answer:
2. CuSO4 (aq) + Na2CO3 (aq) CuCO3 (s) + Na2SO4 (aq)

 

Cu 2+ + CO3 2- CuCO3 (s)

 

--------------------------------------------------------------------------------------------

 

3. NaOH (aq) + NH4NO3 (aq) NaNO3 (aq) + NH3 (g) + HOH (l)

 

Decide which compounds should be split into ions:

 

Na|OH (aq) + NH4|NO3 (aq) Na|NO3 (aq) + NH3 (g) + HOH (l)

Strong Base Soluble Salt Soluble Salt molecular molecular

 

Rewrite the ionic species as ions, and leave the rest as compound formulas:

Na1+(aq)+OH1-(aq)+NH41+(aq)+NO31-(aq)

Na1+(aq)+NO31-(aq) + NH3 (g)+HOH(l)

 

Cancel the Spectator Ions:

Na1+(aq)+OH1-(aq)+NH41+(aq)+NO31-(aq)

Na1+(aq)+NO31-(aq) + NH3 (g)+HOH(l)

 

Final Net Ionic Answer:
3. NaOH (aq) + NH4NO3 (aq) NaNO3 (aq) + NH3 (g) + HOH (l)

OH 1- + NH4 1+ NH3 (g) + H2O (l)

 

------------------------------------------------------------------------------------------

 

 

 

4. BaBr2 (aq) + ZnSO4 (aq) BaSO4 (s) + ZnBr2 (aq)

 

Decide which compounds should be split into ions:

 

Ba|Br2 (aq) + Zn|SO4 (aq) BaSO4 (s) + Zn|Br2 (aq)

Soluble Salt Soluble Salt Insoluble salt Soluble Salt

 

Rewrite the ionic species as ions, and leave the rest as compound formulas

Ba2+(aq)+ 2Br1-(aq) + Zn2+(aq) + SO42-(aq)

BaSO4(s) + Zn2+aq) + 2Br1-(aq)

Cancel the Spectator Ions:

Ba2+(aq) + 2Br1-(aq) + Zn2+(aq) + SO42-(aq)

BaSO4(s) + Zn2+(aq) + 2Br1-(aq)

 

Final Net Ionic Answer:
4. BaBr2 (aq) + ZnSO4 (aq) BaSO4 (s) + ZnBr2 (aq)

 

Ba 2+ + SO4 2- BaSO4 (s)

 

---------------------------------------------------------------------

 

5. Cr(OH)2 (s) + HCl (aq) First Complete the Product:

 

Cr(OH)2 (s) + 2HCl (aq) CrCl2 (aq) + HOH (l)

 

Decide which compounds should be split into ions:

Cr(OH)2 (s) + 2 H|Cl (aq) Cr|Cl2 (aq) + HOH (l)

Insoluble Salt Strong Acid Soluble Salt Molecular

 

Rewrite the ionic species as ions, and leave the rest as compound formulas:

Cr(OH)2 (s) +2H1+(aq) + 2Cl1-(aq)Cr2+(aq)+ 2Cl1-(aq) + HOH(l)

 

 

 

 

 

 

 

 

Cancel the Spectator Ions:

 

Cr(OH)2 (s)+ 2H1+(aq)+ 2Cl1-(aq) Cr2+(aq)+ 2Cl1-(aq) + HOH(l)

 

 

Final Net Ionic Answer:
5. Cr(OH)2 (s) + 2 HCl (aq) CrCl2 (aq) + H2O (l)

Cr(OH)2 (s) + 2 H 1+ (aq) Cr 2+ (aq) + 2 H2O (l)

 

From the Textbook:

NetIonicReactions

NetIonicReaction2

 

NetIonicReactionPrecipitation

NetIonicReactionPrecipitation2

 

 

Video:

http://www.brightstorm.com/science/chemistry/chemical-reactions/net-ionic-equation/