Final answer:
The chemical equation Pb(NO3)2(aq) + 2 NaCl(aq) → 2 NaNO3(aq) + PbCl2(s) is balanced with Pb, Na, Cl, and NO3 ions present in equal numbers on both the reactant and product sides.
Step-by-step explanation:
The student's question involves balancing a chemical equation and identifying the phases of each substance involved. The corrected balanced chemical reaction for the combination of lead nitrate and sodium chloride is:
Pb(NO3)2(aq) + 2 NaCl(aq) → 2 NaNO3(aq) + PbCl2(s)
In this reaction, Pb(NO3)2 is in aqueous solution (aq), meaning it is dissolved in water. It reacts with 2 NaCl, which is also in aqueous solution. The products are 2 NaNO3, remaining in aqueous solution, and PbCl2, which precipitates out of the solution as a solid (s). The number of atoms for each element is the same on both the reactant and product sides, indicating that the equation is properly balanced.