new beaker. Think about if you want to take the mass of the new beaker

before pouring the liquid into it. Rinse the solid with more boiling distilled

water and add that to the new beaker as well.

3. Once the liquid in the new beaker is cool to the touch, place that beaker in an

ice bath for 15 minutes to cool it down to zero degrees Celsius. After the

beaker is cooled in the ice bath you should see a new solid formed. What

component is the solid that forms in the ice bath? Use the solubility properties

to determine what components are in the solution and what components are

in the solid at this time.

4. Use vacuum filtration to separate the liquid from the solid. Before performing

vacuum filtration, make sure to think about what information you will need to

determine the mass of the solid and what you will use to wash the solid (either

boiling water or ice water).

5. We now have two solids and one liquid. The solid on the filter paper can be

dried by continually pulling the vacuum. The solid in the beaker can be dried

by gently heating over a flame. The component that is still dissolved in water

can be isolated by transferring to a beaker and gently heating to remove the

water.

6. When heating to remove the water, use “boiling stones,” so the solution does

not splatter. Add a few boiling stones to the solution. Think about whether you

will need to know the mass of these stones to determine the mass of the last

component.

Safety Considerations

Practice appropriate fire safety protocols for using Bunsen burners and working

with hot glassware. Examine SDS sheets for NaCl, SiO₂, and benzoic acid

(C₆H₅COOH) to note special safety considerations for working with these

materials.

Waste Disposal

Dispose of solid waste in the appropriately labeled solid waste container. Dispose

liquid waste in the appropriately labeled liquid waste container.

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