Multiple Choice
A beaker contains aqueous solutions of calcium and barium nitrates. Aqueous sodium carbonate is added to the beaker, and a precipitate forms. What is the composition of the precipitate?
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18. Aqueous Equilibrium
Precipitation: Ksp vs Q
Multiple Choice
Which of the following represents the molecular equation for the precipitation reaction that occurs when nickel (II) nitrate is mixed with barium sulfide?
A
No reaction occurs
B
Ni(NO3)2 + BaS → NiS + Ba(NO3)2
C
Ni(NO3)2 + BaS → Ba(NO3)2 + Ni(NO3)2
D
Ni(NO3)2 + BaS → Ni(NO3)2 + BaS
Verified step by step guidance1
Identify the reactants in the given problem: nickel (II) nitrate, which is Ni(NO3)2, and barium sulfide, which is BaS.
Determine the possible products of the reaction. In a precipitation reaction, ions in solution combine to form an insoluble solid. Here, Ni^2+ from Ni(NO3)2 can combine with S^2- from BaS to form nickel (II) sulfide, NiS, which is insoluble in water.
Write the balanced molecular equation for the reaction. The reactants are Ni(NO3)2 and BaS, and the products are NiS and Ba(NO3)2. The balanced equation is: Ni(NO3)2 + BaS → NiS + Ba(NO3)2.
Verify the solubility of the products. NiS is insoluble in water, which confirms that a precipitation reaction occurs. Ba(NO3)2 is soluble in water, remaining in solution.
Conclude that the correct molecular equation for the precipitation reaction is: Ni(NO3)2 + BaS → NiS + Ba(NO3)2, as it shows the formation of the insoluble precipitate NiS.
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