Preparing a Standard Solution

Why is it important to ensure that the solute is pure before making a standard solution?

• To ensure the solution has the correct concentration

• To prevent the solute from reacting with the container

• To make the solution dissolve faster

• To avoid using too much distilled water

What is the purpose of weighing the solute on/in a plastic weighing boat (container) before transferring it to a beaker?

• To prevent the solute from reacting with the beaker

• To measure the exact amount of solute used

• To make the solute dissolve faster

• To ensure the solute is pure

Why is distilled water used instead of tap water when dissolving the solute?

• Distilled water is cheaper

• Distilled water is more reactive

• Distilled water does not contain unaccounted substances

• Distilled water dissolves solutes faster

What should you do if the solute does not completely dissolve in the initial volume of distilled water?

• Add more solute

• Add a little more distilled water

• Use tap water instead

• Heat the solution

Why is a beaker used to dissolve the solute before transferring it to a volumetric flask?

• Beakers are easier to clean

• Beakers are easier to stir

• Beakers are more accurate for measuring

• Beakers are cheaper

What is the purpose of the engraved mark on a volumetric flask?

• To measure the temperature of the solution

• To indicate the correct volume for the solution

• To help in stirring the solution

• To prevent the flask from breaking

Why is it important to wash the stirring rod, beaker and funnel into the volumetric flask?

• To clean the equipment

• To ensure all dissolved solute is transferred

• To cool down the solution

• To prevent contamination

Tags

NGSS.HS-ETS1-3

What should be done if a funnel is used to transfer the solution into the volumetric flask?

• The funnel should be dried

• The funnel should be washed into the volumetric flask

• The funnel should be heated

• The funnel should be replaced

How should the volumetric flask be filled to ensure the correct concentration of the solution?

• Fill it to the top

• Fill it until the bottom of the meniscus touches the engraved mark

• Fill it halfway

• Fill it until the top of the meniscus touches the engraved mark

Why is it necessary to close and invert the volumetric flask after making up the solution to the mark?

• To cool the solution

• To mix the solution thoroughly

• To remove air bubbles

• To prevent evaporation