Removing the solids: Let the solids sink to the bottom of the beaker. Using a plastic
pipette, transfer the liquid into a centrifuge tube. Centrifuge down the solids and then
remove the liquid into a Buchner funnel equipped with #1 filter paper (use 50 ml flask
and remember that you always turn on the vacuum before adding the solution). Be
careful not to transfer the solids into the funnel as this will dramatically slow the
filtration. Wash the solid that are left in the centrifuge tube twice with 0.5 ml DI water
and then transfer the sediment into the funnel and allow the residual solution to filter.