Mixture of Solids

Topics: Sodium chloride, Chemistry, Flowchart Pages: 2 (441 words) Published: June 2, 2013
CK – Lab Report
Separation of a Mixture of Solids

PROCEDURE COMMENTS:
Initial Flowchart
Recovery of sand = Sand was obtained by decanting it from a dissolved solution of sand, benzoic acid, and salt. The sand is insoluble, while the other two components dissolve in the water. Recovery of benzoic acid = Benzoic acid was obtained by filtering off the smaller sodium chloride crystals. After, the larger benzoic acid crystals were left to dry. Recovery of salt = Salt was obtained by filtering it from the benzoic acid crystals. Due to its smaller crystals, it could be separated after placed in the ice bath.

Questions:

A.How did your proposed procedures or flow charts at the beginning of this experiment compare to the actual procedures of this lab exercise? The proposed procedures from the flow chart were very similar to the experiment. Once major difference was in the recovery of the salt and benzoic acid. In the proposed procedure, the solution was placed in the ice bath until only the salt crystalized. This allowed the benzoic acid in liquid form to be filtered out. In the actual experiment, both were allowed to crystalize, and the smaller salt crystals were filtered out.

B.Discuss potential advantages or disadvantages of your proposed procedure compared to the one actually used. The advantage to the proposed procedure comes from the trouble that may result when filtering one type of crystal from the other. Determining the right size filter could be difficult, and might not stop every benzoic acid crystal from falling through. In the proposed procedure one set of crystals was left, while a dissolved solution was filtered. This could be easier, because filtering would not have to be so precise.

C.How would you explain a sand recovery percentage that is higher than the original sand percentage? A higher recovery of sand might occur if the other components were not allowed to fully dissolve before decanting. This would mix the sand with salt and...
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