SACE Stage 1 Chemistry - 4.3 Quantities in Reactions (Part 2)

What is a standard solution?

• A solution with an unknown concentration.

• A solution used only for consumption.

• A solution of accurately known concentration.

• A solution that is always highly water soluble.

When preparing a standard solution, what is the correct way to add the final drops of distilled water to the volumetric flask?

• Fill until the liquid is slightly above the graduation mark.

• Fill until the top of the meniscus aligns with the graduation mark.

• Fill until the bottom of the meniscus aligns with the graduation mark.

• Fill until the flask is completely full, regardless of the mark.

Why is it often necessary to perform a dilution?

• To increase the concentration of a stock solution.

• When a stock solution is too concentrated for its intended use.

• To make a solution less stable.

• To prepare a primary standard.

What quantity of the solute remains unchanged during a dilution process?

• Its concentration.

• Its volume.

• Its number of moles.

• Its density.

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