(a) Assume a sample of water has been contaminated with lead (II) nitrate. Select a solution that can be used to remove (precipitate) the lead ions from the water. For the reaction: Write a balanced chemical equation, the total ionic equation, the net ionic equation. Suppose a solution of industrial wastewater is contaminated with 4.2 x 10 to the -6 mol/L of lead (II) nitrate, what mass of your reactant would be needed to precipitate all the lead from 250mL of the wastewater?

(b) Scale consists of precipitated carbonate due to hard water. Scale can be removed by a reaction with vinegar (acetic acid). Assume kettle is contaminated with 3.35g solid magnesium carbonate. What volume of cleaning vinegar (1.50mol/L acetic acid) is needed to remove the scale? Include a balanced chemical equation.