Preparing Soluble Salts Using Insoluble Reactants

The video tutorial explains how to prepare soluble salts using insoluble reactants like zinc oxide. It outlines the process of adding excess base to react with acid, filtering out insoluble reactants, and evaporating water to obtain pure salt crystals. The technique is applicable to various insoluble reactants, including metals and metal carbonates.

What is the role of zinc oxide in the preparation of soluble salts?

• It is the solvent for the reaction.

• It is the insoluble base used in the reaction.

• It acts as a catalyst.

• It is the final product of the reaction.

Why is it necessary to add an excess of the insoluble base during the reaction?

• To change the color of the solution.

• To ensure all the acid reacts.

• To increase the temperature of the reaction.

• To decrease the reaction time.

What is the purpose of filtering the solution after the reaction?

• To add more reactants.

• To cool down the solution.

• To separate the excess insoluble base.

• To remove the soluble salt.

How is the water removed from the salt solution to obtain dry salt crystals?

• By cooling the solution rapidly.

• By adding a drying agent.

• By adding more water.

• By evaporating the water through heating.

What indicates that the solution has reached the point of saturation during evaporation?

• The solution becomes clear.

• The solution starts to boil.

• The solution changes color.

• Crystals begin to form.