Std Solutions

What is a standard solution?

• A solution of unknown concentration.

• A solution of known concentration.

• A solution used only for titrations.

• A solution that is always 0.1 mol dm-3.

Which method is used to accurately determine the mass of anhydrous sodium carbonate transferred from the weighing boat to the beaker?

• Direct weighing on a balance.

• Weighing by difference.

• Using a measuring cylinder.

• Estimating by volume.

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After dissolving the solid in a beaker and before making up to the final volume in a volumetric flask, what is the recommended step to ensure all solute is transferred?

• Heat the solution to ensure complete dissolution.

• Add more solid to increase concentration.

• Rinse the beaker and funnel with distilled water and add the rinsings to the flask.

• Pour the solution directly into the volumetric flask without rinsing.

What is the final step to ensure the concentration of the standard solution is uniform throughout the volumetric flask?

• Heat the flask gently.

• Add more distilled water.

• Stopper the flask and invert it several times.

• Let it sit undisturbed for an hour.