Lab 3 Separation of a Mixture Objective Separate

Lab 3 Separation of a Mixture Objective Separate a mixture of salt, sand & naphthalene (nap) Experiment Mass of 250 m. L 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 beaker Let the nap cool and deposit on the bottom of the dish Scrape off the deposit into trash Heat again until cloud no longer forms

Mass of beaker without naphthalene = _____ g Add ~30 m. L of water to the mix in the beaker Mass of filter paper = _____ g Fold filter paper to fit the funnel

Pour mixture into funnel. Rinse beaker with wash bottle. Let filter paper dry overnight in storage drawer Mass of dried filter paper with sand = _____ g

Make Sure… Your 250 m. L beaker is NOT wet or cracked.

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 naphthalene? Explain why or 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