Lab 3Separation of a Mixture

Objective -

Separate a mixture of salt, sand & naphthalene (nap)

Experiment -

Mass of 250 mL beaker = _________ g

Mass of beaker w/ about 2 grams of mixture = ______ g

Heat the beaker with evap. dish w/ ice on top. A white cloud of nap. will develop in beakerLet the nap cool and deposit on the bottom of the dishScrape off the deposit into trashHeat again until cloud no longer forms

Mass of filter paper = _________ g

Mass of beaker without naphthalene = _________ g

Add ~30 mL of water to the mix in the beaker

Fold filter paper to fit the funnel

Mass of dried filter paper with sand = _________ g

Pour mixture into funnel.Rinse beaker with wash bottle.

Let filter paper dry overnight in storage drawer

Your 250 mL beaker is NOT wet or cracked.

Make Sure…

Analysis -

1. How many grams of the mixture did you start with?

2. How many grams of naphthalene did you separate?

3. How many grams of sand did you separate?

4. How many grams of salt did you separate?

5. Calculate the percentage of a) naphthalene, b) salt, c) sand

that was separated.

Results -

Questions -

1. State one way we could have experimentally measured the mass of the salt in your sample.

2. Neglecting experimental error differences between lab groups, should all lab groups in this class have similar percentages of salt, sand and naphthalene? Explain whyor why not.

3. Was this mixture a homogeneous or heterogeneous? Explain how you know.

4. State three examples each of heterogeneous and homogenous mixtures.

5. Define filtrate