Chemical Analysis Quiz

What does qualitative chemical analysis indicate?

• Chemical reactivity of the substance

• Physical state of the substance

• Presence of a particular species

• Concentration of the substance

What is the purpose of simple chemical tests in qualitative analysis?

• To identify the cation and anion in a salt

• To calculate the molar mass of the substance

• To determine the concentration of the substance

• To measure the pH of the solution

What is the purpose of adding dilute aqueous acid to a suspected carbonate solid/solution in a test for carbonate ions?

• To form a white precipitate

• To produce carbon dioxide gas

• To neutralize the solution

• To dissolve the carbonate solid

What is the positive result/observation when testing for sulfate(VI) ions?

• Formation of a green solution

• Formation of a white precipitate

• Formation of a yellow precipitate

• Effervescence

What is the purpose of adding dilute nitric acid followed by aqueous silver nitrate solution in a test for halide ions?

• To produce carbon dioxide gas

• To neutralize the solution

• To form a white precipitate

• To dissolve the halide solid

What is the purpose of adding aqueous ammonia solution to the silver halide precipitate in the test for halide ions?

• To neutralize the solution

• To form a white precipitate

• To dissolve the precipitate

• To produce carbon dioxide gas

Why is there a correct order for carrying out the tests for carbonate, sulfate, and halide ions?

• To avoid false positive results

• To increase the solubility of the precipitates

• To speed up the chemical reactions

• To save time

What is the purpose of adding warm dilute aqueous sodium hydroxide to the solution thought to contain NH4+ ions in the test for Ammonium ions?

• To produce ammonia gas

• To form a white precipitate

• To dissolve the ammonium solid

• To neutralize the solution

What is the positive result/observation when testing for Ammonium ions?

• Formation of a yellow precipitate

• Formation of a white precipitate

• Formation of a green solution

• Production of ammonia gas

What is the purpose of using moist pH indicator paper in the test for Ammonium ions?

• To measure the pH of the solution

• To identify the cation and anion in a salt

• To determine the concentration of the substance

• To detect the presence of ammonia gas