You Have an Aqueous Solution Containing Lead(II),sodium,iron(III),and Potassium Ions

You have an aqueous solution containing lead(II) ,sodium,iron(III) ,and potassium ions.You need to devise a way to separate the ions from one another.Which of the following statements is NOT correct regarding your method?

A) Lead(II) ions can be precipitated as PbCl₂ by adding a source of chloride ions.
B) Iron(III) ions can be precipitated as Fe(OH) ₃ by adding a source of hydroxide ions.
C) Adding HCl(aq) or NH₃(aq) can be used to adjust the acidity or basicity of the solution.
D) Sodium and potassium cannot be separated by precipitation.
E) Sodium and potassium can be separated by precipitation of potassium with sulfate ions.