Question

When using vacuum filtration to separate two solids, what techniques should you use to ensure a quantitative separation?

Note: Assume this theoretical separation is done using water.
Select all that apply.
a. Carefully rinse the flask into the filter funnel with a small amount of water
b. Wet the filter paper before pouring the mixture into the filter funnel
c. Wash the solid on the filter paper with a small amount of water
d. Dry the solid on the filter paper after the separation

Answer 1

In vacuum filtration, you should wet the filter paper before use, carefully rinse the flask, wash the solid with water, and dry the solid after filtration for a quantitative separation.

Step-by-step explanation:

When using vacuum filtration to separate two solids and ensure a quantitative separation, the following techniques should be used:

• Wet the filter paper before pouring the mixture into the filter funnel to ensure that it adheres properly to the funnel and prevents the solids from passing through the filter medium.
• Rinse the flask into the filter funnel using a small amount of water to make sure all the solids are transferred from the flask to the filter paper.
• Wash the solid on the filter paper with a small amount of water to remove any remaining impurities that can be dissolved away.
• Dry the solid on the filter paper after the filtration process to remove any excess water and obtain the solid in its pure form.

By implementing these techniques, the solid material is efficiently captured on the filter paper, and loss of the solid is minimized, leading to a more accurate and complete separation of the two solids.