Quantitative Separation Techniques of a Mixture of C10H8, Nacl and Sio2

1688 Words Sep 25th, 2012 7 Pages
Resolving and Determining the Percentages of Naphthalene, NaCl and SiO2 in a Mixture with the use of Separation Techniques
Castro, Sarleen G.* Cid, John Emmanuel V., Clemente, Christian Joy G.
Group 5, 1CHEM,
Department of Chemistry, College of Science,
University of Santo Tomas,
España, Manila, 1015
August 24, 2012

A mixture can be homogenous or heterogenous, depending if the mixture has been uniform throughout the mixture or not. One of the objectives is to separate C10H8, NaCl and SiO2, and determine their percentages in the mixture. Since the mixture was not chemically combined, they can be separated by physical means. One can use a variety of techniques such as sublimation, selective dissolution, filtration or evaporation.
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The apparatuses needed were an evaporating dish, a watch glass, a beaker, a funnel, a filter paper, a crucible and the analytical balance.
As an initial step, Sample A Mixture, was weighed 0.5841g by using an analytical balance. The watch glass, beaker, and filter paper were also pre-weighed separately.
For the separation of Naphthalene, sample A Mixture was placed in an evaporating dish, covered with a pre-weighed watch glass. The sides were sealed with a masking tape and a moist tissue was placed over the watch glass. The whole set-up was gently heated until white vapors evolved underneath the watch glass. The set-up was removed from heat and cooled. Slowly, the watch glass was separated from the evaporating dish. The watch glass plus the sublimate were weighed.
For the separation of the salt from sand, distilled water was poured into the remaining mixture on the evaporating dish and the solution was stirred. The solution was filtered and the filtrate was collected in a pre-weighed beaker. The residue was washed with additional distilled water and the filtrates were combined. The contents of the beaker were gently heated and evaporated while the filter paper containing the sand was placed in a crucible and was dried inside an oven at 110oC for 30 minutes. When the salt started to pop, the beaker was removed from heat. Both the beaker with salt and the filter paper with sand were weighed.

Figure 1: From left to right order, these