Which of the following is a precipitation reaction?

Which of the following is a precipitation reaction?



a. 2 LiI(aq) +Hg2(NO3)2(aq) →Hg2I2(s) + 2 LiNO3(aq)

b. NaCl(aq) + LiI(aq)→ NaI(aq) + LiCl(aq)

c. HCl(aq) + KOH(aq)→ KCl(aq) + H2O(l)

d. Zn(s) + 2AgNO3(aq) → 2 Ag(s) +Zn(NO3)2(aq)

e. None of the above areprecipitation reactions.

Answer

For a reaction to be a precipitation reaction, a solid must beformed on the products side (the right side) of the equation.This eliminates B C, and E. Another fact about aprecipitation reaction is that two aqueous solutions onthe reactants side (the left side) must form a new product. Thinkabout it; if there was a solid already in the mixture before theprecipitation process, how could you know whether somethingprecipitated out? Both A and B have solids on theproducts side, but D has both a solid and an aqueous solutionon the left side, therefore it cannot be the right choice. ChooseA.

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