Question

making predictions about reactions
choose the correct products for the double replacement reaction below. click here to access the solubility rules to determine which product, if any, forms a solid precipitate in the reaction.
$pbcl_2 + mgso_4 \
ightarrow ?$
$pb + o_2 + mgcl$
$pbmg + clso_4$
$pbso_4 + mgcl_2$
$pb(so_4)_2 + mgcl$
done

Explanation:

Step1: Identify double displacement pattern

In double displacement reactions, cations and anions swap: $\text{AB} + \text{CD}
ightarrow \text{AD} + \text{CB}$

Step2: Match ions from reactants

Reactants: $\text{PbCl}_2$ (cation $\text{Pb}^{2+}$, anion $\text{Cl}^-$) and $\text{MgSO}_4$ (cation $\text{Mg}^{2+}$, anion $\text{SO}_4^{2-}$). Swap to get $\text{PbSO}_4$ and $\text{MgCl}_2$.

Step3: Verify solubility

$\text{PbSO}_4$ is insoluble (forms precipitate), $\text{MgCl}_2$ is soluble, which fits the reaction rules.

Answer:

PbSO₄ + MgCl₂