# Quantitative Separation of Mixtures

Pages: 2 (472 words) Published: December 4, 2011
Experiment 3Quantitative Separation of Mixtures
This experiment performs the quantitative separation of thecomponents of a mixture. A mixture is the mixing of two or more substancestogether. The proportions of the components in the mixture can be varied.And the resulting mixture can be either homogeneous or heterogeneous,depending on the properties of components such as solubility.In this experiment, you are going to separate a water-solublecomponent from water-insoluble components. The heterogeneous mixture isplaced in water, whpre the water-soluble components dissolve. Separatingwater-soluble and water-insoluble components is achieved by filtration. Theseparated solid is dried and weighed to obtain the mass and percentcomposition by mass. The water-soluble component, in a homogeneousaqueous solution, can be recovered by evaporating the water, thenmeasuring the mass of the residue. EQUIPMENT

Beakers, evaporating dish, stirring rod, funnel, funnel holder, filter paper,watch glass, tong, and balance. PROCEDURE
1. Take an unknown sample bottle from the cart and record the samplenumber in your lab report.2. Measure the mass of the sample bottle using a top loading balance, m
b+s.3. Transfer the sample into a 400 mL beaker, then measure the sample bottleagain, m
b,. The difference in these two measurements gives the mass of mixture in the 400 mL, m
s, =
m
b+s +
m
b4. Add about 150 mL of distilled or tap water, then stir the mixture for 5minutes to make sure that all soluble components dissolve.5. Measure the mass of a filter using the same balance.6. Fold the weighed filter paper (your instructor will show you how), thenplace it in the funnel and wet it with water (using the wash bottle) to makesure the filter paper is firmly attached to the funnel.

7. Pour your mixture from 400 mL into the funnel for separation of liquid frothsolid. Keep liquid level in the funnel about 1 cm below the edge of the filterpaper.8. Wash solids in...