Vacuum filtration is a commonly used technique in laboratories to separate solids from liquids. To set up a vacuum filtration flask kit, you will need a few essential components. Here's a step-by-step guide on how to assemble and use a vacuum filtration flask kit:

1. Gather the equipment: You will need a vacuum filtration flask, with a filter flask, a funnel, a rubber stopper or ground glass joint, a vacuum pump or aspirator, and a vacuum hose.
2. Prepare the filtration flask: Ensure that the vacuum filtration flask is clean and dry. 
3. Connect the vacuum hose: Connect one end of the vacuum hose to the rubber stopper on the filtration flask. The other end of the hose will be connected to the vacuum pump or aspirator.
4. Set up the filter flask: Place the filter flask on a stable surface next to the filtration flask. Make sure it is clean and dry.
5. Assemble the Buchner funnel: Place the Buchner funnel on top of the filter flask. Ensure a snug fit between the funnel and the flask.
6. Wet the filter paper: Moisten the filter paper slightly with the solvent or liquid you will be using for filtration. This will prevent the paper from floating or tearing during the process.
7. Place the filter paper: Carefully place the pre-moistened filter paper inside the Buchner funnel. Make sure it covers the entire bottom surface evenly.
8. Attach the funnel to the filtration flask: Insert the stem of the Buchner funnel into the rubber stopper or ground glass joint on the filtration flask. Ensure a tight seal between the two components to prevent any leakage.
9. Turn on the vacuum pump or aspirator: Start the vacuum pump or aspirator to create a vacuum inside the filtration flask. This will pull the liquid through the filter paper and into the filter flask, leaving the solid particles behind.
10. Start the filtration process: Slowly pour the liquid mixture into the Buchner funnel. The vacuum pressure will draw the liquid through the filter paper and into the filter flask, while the solid particles will be trapped on the surface of the filter paper.
11. Collect the filtrate: Once the filtration process is complete, turn off the vacuum pump or aspirator. Carefully remove the filter flask containing the liquid filtrate from the setup.
12. Dispose of the solid waste: Remove the filter paper containing the solid particles and dispose of it properly. You can either discard it in the appropriate waste container or collect the solid waste for further analysis or disposal.
13. Clean and store the equipment: After use, clean all the components of the vacuum filtration flask kit thoroughly with appropriate solvents or cleaning agents. Dry the components before storing them in a clean and safe place.
14. Using a vacuum filtration flask kit is an efficient and effective way to separate solids from liquids in a laboratory setting. By following these steps, you can easily set up and use the kit for your filtration needs.