CHM 1025C Sample Pretest Name:___Answers_______


Module Eight: Part G Rewriting Equations Ionically 10 points

Rewrite the following (unbalanced) equations ionically, cancel spectator ions and then balance the net ionic reactions. Show as ions: soluble salts and strong acids and strong bases; leave as molecules/formula units insoluble salts, weak acids, covalent molecules. Strong acids are: Perchloric Acid; Hydrochloric Acid; Nitric Acid; Sulfuric Acid; Hydrobromic Acid; Hydroiodic Acid. Strong bases are Sodium hydroxide, potassium hydroxife, Calcium hydroxide, Barium hydroxide and Strontium hydroxide


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


OH 1- + H 1+ HOH (l)




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



Cu 2+ + CO3 2- CuSO4 (s)




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)


Ba 2+ + SO4 2- BaSO4 (s)




5. Cr(OH)2 (s) + HCl (aq) CrCl2 (aq) + H2O (l)



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