Crystallization

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Lab # 4
Crystallization

Jonathan Odell
Partners: Allyson Chiu
Michelle Jung
Regine Ong
Day 1 Period 3
Experiment conducted: November 15, 2012
Submitted date: November 21, 2012

Introduction:
In this lab, the students were separated into groups of four in which were given a test tube that was half full of hydrate sodium thiosulfate. The experiment’s purpose was to observe the reaction of the hydrate sodium thiosulfate in different situations, such as being shook over a period of time, or place another hydrate sodium thiosulfate pellet in its liquid form. This allows the students to observe the process of crystallization. Throughout the experiment, the students are asked to melt the hydrate sodium thiosulfate into liquid form, having no definite shape but a definite volume. Hydrate sodium thiosulfate melting point is 48.3 oC. Crystallization is a liquid and solid chemical separation that takes place due to mass transfer of a solute from the liquid solution to a pure solid crystalline, a phase that occurs after the reaction occurs.

The hypothesis is that the hydrate sodium thiosulfate will crystallize after being shaken in a fast, repetitive motion. This will be because of the kinetic energy that will be present when the liquid is being shaken around. Kinetic energy, being constant energy used at work which would be the kinetic state, is one of the two types of energy that can be in one or two states. The other is potential energy which is stored energy. The independent variable was the amount of hydrate sodium thiosulfate put into the test tubes. The dependent variables were the time it took for the hydrate sodium thiosulfate to melt and the process in which the test tube took to crystallize. The constant variable was the hydrate sodium thiosulfate.

Materials:
1) Test tube
2) Hydrate sodium thiosulfate (half test tube worth)
3) Hot plate
4) Beaker
5) Stoppers (test tube)
6) Safety goggles
7) Distilled water
8)...
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