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 a plastic weighing boat 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 thoroughly

• 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 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