Sample Problem 4.3
Predicting precipitation reactions and writing ionic equations
PROBLEM:
Predict whether a reaction occurs when each of the following pairs of solutions are mixed. If a reaction occurs, write balanced molecular, total ionic, and net ionic equations, and identify the spectator ions.
(a) sodium sulfate(aq) + strontium nitrate(aq)
(b) ammonium perchlorate(aq) + sodium bromide(aq)
write ions
combine anions and cations
check for insolubility
(Table 4.1)
eliminate spectator ions from net ionic equation
PLAN:
SOLUTION:
(a) Na2SO4(aq) + Sr(NO3)2 (aq) 2NaNO3(aq) + SrSO4(s)
2Na+(aq) + SO42-(aq) + Sr2+(aq) + 2NO3-(aq)
2Na+(aq) + 2NO3-(aq) + SrSO4(s)
SO42-(aq)+ Sr2+(aq) SrSO4(s)
(b) NH4ClO4(aq) + NaBr (aq) NH4Br (aq) + NaClO4(aq)
All reactants / products are soluble - no reaction occurs.
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