ADDITION OF POTASSIUM IODIDE.

Question 1

no precipitate forms .

Answer 1

Al 3+ ion

Question 2

a bright yellow precipitate of lead(lI) iodide forms

Answer 2

pb 2+ ion

Question 3

note- why it turns yellow or doesn’t

Answer 3

If a solution was thought to contain either Pb 2+ or Al 3+ ions, the aqueous KI is used to
determine which ion is present. If Pb 2+ ions are actually present, a yellow precipitate will be seen. If no precipitate is formed, then Al
3+ ions are present.