Validating Conservation of Mass Through Barium Chloride and Sodium Sulphate Reactions

The video tutorial demonstrates the verification of the law of conservation of mass through a chemical reaction involving barium chloride and sodium sulphate. It outlines the aim, materials, and procedure, followed by observations of the reaction where a white precipitate forms. The tutorial concludes with calculations showing that the total mass of reactants equals the total mass of products, confirming mass conservation.

What is the primary aim of the experiment involving barium chloride and sodium sulphate?

• To observe the color change in a reaction

• To measure the density of barium chloride

• To verify the law of conservation of mass

• To determine the solubility of sodium sulphate

Which of the following is NOT mentioned as part of the apparatus used in the experiment?

• Watch glass

• Electronic balance

• Glass stirrer

• Bunsen burner

How much barium chloride is weighed for the experiment?

• 16.1 g

• 10.5 g

• 5.0 g

• 7.2 g

What is observed when the barium chloride and sodium sulphate solutions are mixed?

• A color change to blue

• Formation of a white precipitate

• Temperature increase

• Emission of gas

What is the mass of the empty 250 ml beaker used in the experiment?

• 335.93 g

• 223.3 g

• 100 g

• 112.63 g

What is the total mass of the reactants before the precipitation reaction?

• 335.93 g

• 223.3 g

• 112.63 g

• 116.1 g

How is the final mass of the reaction mixture calculated?

• By using a colorimeter

• By measuring the volume of the mixture

• By subtracting the mass of the empty beaker from the mass of the beaker with the mixture

• By adding the masses of all reactants

What does the experiment demonstrate about the mass of reactants and products?

• Mass of reactants is greater than mass of products

• Mass of products is greater than mass of reactants

• Mass is conserved during the chemical reaction

• Mass is lost during the reaction

What is the density of distilled water used in the experiment?

• 1.5 g per ml

• 2 g per ml

• 1 g per ml

• 0.5 g per ml