Physical Change: Crystallization of Sodium Thiosulfate Lab

Physical Change:  Crystallization of Sodium Thiosulfate Lab
Physical Change:  Crystallization of Sodium Thiosulfate Lab
Physical Change:  Crystallization of Sodium Thiosulfate Lab
Physical Change:  Crystallization of Sodium Thiosulfate Lab
Physical Change:  Crystallization of Sodium Thiosulfate Lab
Physical Change:  Crystallization of Sodium Thiosulfate Lab
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Product Description
This is a quick and fun lab that will get lots of oohs and ahhs from your students. Two versions are included. One is for honors or pre-ap chem level and includes a mole or stoichiometry calculation. The other version is appropriate for on-level, middle school, or GTE elementary. You could also use it as an introduction to physical change in upper level chem classes.

Students make a small amount of a supersaturated solution of sodium thiosulfate. After cooling it, they drop a single seed crystal into the solution and watch the entire solution solidify around it. Most students will reheat and do it several times. It is a very engaging activity.

This is a physical change. The lab includes an introduction to supercooling and sodium thiosulfate and how it is produced.

Keywords: chemistry, experiment, supersaturated, supercooling, solidification, crystallization, moles, stoichiometry, Avogadro's number, physical change, crystal, ionic compound, ions, formula units.
Total Pages
6 pages
Answer Key
N/A
Teaching Duration
40 minutes
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