Chemical Tests for Carbonate Ions

What is the structural arrangement of oxygen atoms around the carbon atom in a carbonate ion?

• Triangular planar

• Tetrahedral

• Square planar

• Linear

Which of the following is a preliminary test for detecting carbonate ions?

• Benedict's test

• Flame test

• Titration

• Dry heating test

What is the main observation when carbonate is heated in a dry heating test?

• Change in color of the salt

• Evolution of a colorless, odorless gas

• Formation of a blue precipitate

• Emission of a colored gas

What happens to lime water when it reacts with carbon dioxide in the dry heating test?

• It turns blue

• It becomes clear

• It turns milky

• It remains unchanged

In the dilute sulfuric acid test, what is the result of the reaction between carbonate and the acid?

• No visible reaction

• Emission of a pungent smell

• Brisk effervescence with a colorless gas

• Formation of a red precipitate

What is the role of lime water in the dilute sulfuric acid test?

• To neutralize the acid

• To act as a catalyst

• To dissolve the carbonate

• To detect the presence of carbon dioxide

Which test involves the use of magnesium sulfate to confirm the presence of carbonate ions?

• Dilute sulfuric acid test

• Magnesium sulfate test

• Dry heating test

• Dilute hydrochloric acid test

What is the expected result when carbonate reacts with magnesium sulfate?

• Formation of a white precipitate

• No visible change

• Evolution of a colored gas

• Formation of a blue solution

What precaution should be taken when collecting gas during these tests?

• Completely cover the test tube with an empty test tube

• Use a funnel to direct the gas

• Use a flame to ignite the gas

• Add more acid to speed up the reaction

Why is it important to wear a lab coat and gloves during these experiments?

• To look professional

• To protect against chemical exposure

• To keep warm in the lab

• To avoid contamination of samples