Testing For Anions

Question 0

Identify carbonate ions.

Answer 0

• add dilute acid
• if carbonate is present, we will see effervescence
• test if gas is CO2 by using limewater

Question 1

Identify chlorides, bromides, and iodides. (HALIDES)

Answer 1

• add equal vol of HNO3
• add AgNO3
• observe color

Chlorides: white precipitate
Bromides: cream precipitate
Iodides: pale yellow precipitate

Question 2

Identify nitrates.

Answer 2

TEST FOR AMMONIA

• put aqueous solution of unknown compound into test tube
• add NaOH and aluminum foil and warm gently
• test gas given off w damp red litmus
• if ammonia is present, litmus paper will turn blue

Question 3

Identify sulfates.

Answer 3

• put aqueous solution of unknown compound into test tube
• add equal vol of dilute HCl
• add barium salt (chloride/nitrate)
• if WHITE PRECIPITATE forms: compound is a sulfate