A precipitation reaction is a type of double displacement reaction where a preci
ID: 885425 • Letter: A
Question
A precipitation reaction is a type of double displacement reaction where a precipitate is formed. Which of the following is a precipitation reaction?
HClO4(aq) + KOH(aq) --> KClO4(g) + H2O(l)
NaHCO3(s) + HBr(aq) --> NaBr(aq) + H2O(l) + CO2(g)
Na2CO3(aq) + ZnCl2(aq) --> ZnCO3(s) + 2NaCl(aq)
Zn(s) + 2HCl(aq) --> ZnCl2(aq) + H2(g)
2NaCl(aq) + Pb(NO3)2(aq) --> PbCl2(s) + 2NaNO3(aq)
A.HClO4(aq) + KOH(aq) --> KClO4(g) + H2O(l)
B.NaHCO3(s) + HBr(aq) --> NaBr(aq) + H2O(l) + CO2(g)
C.Na2CO3(aq) + ZnCl2(aq) --> ZnCO3(s) + 2NaCl(aq)
D.Zn(s) + 2HCl(aq) --> ZnCl2(aq) + H2(g)
E.2NaCl(aq) + Pb(NO3)2(aq) --> PbCl2(s) + 2NaNO3(aq)
Explanation / Answer
Precipitation reaction is the one in which solid phase is formed when aqueous phase reactants react.
This is identify when there is insoluble product formed in the reaction.
In above given reactions,
Reaction c
Na2CO3(aq) + ZnCl2(aq) --> ZnCO3(s) + 2NaCl(aq)
and
reaction E
2NaCl(aq) + Pb(NO3)2(aq) --> PbCl2(s) + 2NaNO3(aq)
Are you precipitation reaction
since in these reaction, solid products are formed.