8th Grade Science – Professor Shai
Filtration Lab
Section 5.4 – Page 97
Introduction
Filtration is a way
to separate solids by using the characteristic property
of their solubility. Using an appropriate solvent, filtration
allows you to separate soluble solids from insoluble
solids. The technique is simple. You mix the solids
into the solvent and shake like mad until the soluble solid is
dissolved. Then you filter the solution through filter paper and
extract the insoluble solid. The dissolved solid goes right
through the filter paper with the liquid.
To separate a
mixture of two solids using filtration.
Method
1.
Put 1.5 grams of a solid mixture I will give you into a test tube with
5 cc's of water.
2. Stopper the tube and shake like mad until every bit of solid that
can dissolve actually dissolves. This should take about 3 minutes.
3. Filter the solution as shown in figure 5.6 on page 98.
4. Pour an extra 10 cc's of water into the funnel to wash off the
filtered solid, and let the water drain through.
5. Then take all the filtrate (the liquid that went through the
filter), place it in an evaporating dish and boil it until all the
water is gone.
6. You should have the insoluble solid in the filter paper, and
the soluble solid is now in the evaporating dish.
Do problems 4-5, on page 96, and problems 6-8 on pages 98-99. Ask me for help if you are not sure how to do them.