Question

3. Give a simple test that would allow you to distinguish between the following pairs of anions. Tell what you would do and what you should observe for each anion. a. CO32- and SO42- b. Cl and SO42- c. CO32- and CI 4. Give a simple test that would allow you to distinguish between the following pairs of cations. Tell what you would do and what you should observe for each cation. a. B3+ and Ca2+ b. Ca2+ and Sr+ c. Ca2+ and NHA 5. Write the symbol of the cation or anion that give(s) the following reaction: a. Forms a precipitate with AgNO3 that does not dissolve in HNO3. b. Forms a gas (bubbles) with HCl but has no odor,

Answer 1

3

a} acid such as dilute hydrochloric acid, is added to the test compound. Carbon dioxide gas bubbles if carbonate ions are present. Limewater is used to confirm that the gas is carbon dioxide

B} add few drops of a silver nitrate solution to a slightly acidic aqueous solution a white precipitate of silver chloride iwill form.

C} similarly like above test either for carbonate ion for chloride ion

C}