CHAPTER 18. REACTIONS IN AQUEOUS SOLUTION 18.5
c. carbon dioxide
d. hexane (C 6 H 14 )
e. lithium fluoride (LiF)
f. magnesium chloride
6. Three test tubes (X, Y and Z) each contain a solution of an unknown
potassium salt. The following observations were made during a practical
investigation to identify the solutions in the test tubes:
A: A white precipitate formed when silver nitrate (AgNO 3 ) was added to
test tube Z.
B: A white precipitate formed in test tubes X and Y when barium chloride
(BaCl 2 ) was added.
C: The precipitate in test tube X dissolved in hydrochloric acid (HCl) and
a gas was released.
D: The precipitate in test tube Y was insoluble in hydrochloric acid.
a. Use the above information to identify the solutions in each of the test
tubes X, Y and Z.
b. Write a chemical equation for the reaction that took place in test tube
X before hydrochloric acid was added.
(DoE Exemplar Paper 2 2007)More practice video solutions or help at http://www.everythingscience.co.za(1.) 007b (2.) 007c (3.) 007d (4.) 007e (5.) 007f (6.) 007gChemistry: Chemical change 331