Question

question 1
1 pts
identify the reactant that will result in a
precipitation reaction.
h₂so₄ + nac₂h₃o₂
hcl + na₂so₄
kno₃ + nacl
pb(no₃)₂ + nacl

Explanation:

Step1: Recall Precipitation Rules

Precipitation reactions occur when an insoluble solid (precipitate) forms from aqueous reactants. We check each option's products for solubility.

Step2: Analyze Option 1 ($\boldsymbol{H_2SO_4 + NaC_2H_3O_2}$)

Products: $Na_2SO_4$ (soluble) and $HC_2H_3O_2$ (weak acid, soluble). No precipitate.

Step3: Analyze Option 2 ($\boldsymbol{HCl + Na_2SO_4}$)

Products: $NaCl$ (soluble) and $H_2SO_4$ (soluble). No precipitate.

Step4: Analyze Option 3 ($\boldsymbol{KNO_3 + NaCl}$)

Products: $KCl$ (soluble) and $NaNO_3$ (soluble). No precipitate (double - displacement, all ions remain dissolved).

Step5: Analyze Option 4 ($\boldsymbol{Pb(NO_3)_2 + NaCl}$)

Products: $PbCl_2$ and $NaNO_3$. $NaNO_3$ is soluble, but $PbCl_2$ is insoluble (except in hot water, generally considered insoluble for precipitation reactions). So a precipitate of $PbCl_2$ forms.

Answer:

D. $\boldsymbol{Pb(NO_3)_2 + NaCl}$