Will a precipitate form (yes or no) when 50.0 mL of 1.2 * 10^-3 M Pb(NO₃)₂ are added to 50.0 mL of 2.0 * 10^-4 M Na₂S If so, identify the precipitate.

Question

Quizplus · Accepted Answer

When solutions of Pb(NO3)2 and Na2S are mixed, they react to form PbS and NaNO3. The balanced equation for this reaction is:

Pb(NO3)2 + Na2S → PbS + 2NaNO3

Since PbS is insoluble in water, it will precipitate out of solution. Therefore, the answer is A, and the precipitate is PbS.

Will a Precipitate Form (Yes or No) When 50