Inorganic Synthesis

Inorganic Synthesis - added 1 or 2 drops of 0.1 M iodine...

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2/13/08 Inorganic Synthesis – Preparation of Sodium Thiosulfate Pentahydrate Introduction In this lab, we prepared the substance sodium thiosulfate pentahydrate. To prepare it, we heated sulfur with a solution of sodium sulfite in the presence of a small amount of detergent. We used it to perform qualitative experiments and analyzed how it reacted. Chemical Responsibility We worked with many chemicals in this lab. Sodium sulfite and sulfur are skin irritants. Silver nitrate will stain skin. Iodine is toxic, an eye irritant and somewhat corrosive. Hydrochloric acid is toxic, corrosive and will burn skin. Report Sheet (attached) Sample Calculations Discussion of Results In our first test, we added two drops of 0.1 M NaCl and 2 drops of 0.1 silver nitrate to 5 mL of water to produce AgCl. We added a few crystals of our reaction product and we saw that it turned the solution from cloudy to clear. In the second test, we
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Unformatted text preview: added 1 or 2 drops of 0.1 M iodine solution to 5 mL water and added a few crystals. This caused the solution to turn from yellow to clear. In our third test, we dissolved a small amount of the product in 5 mL of water and added 1 mL of 6 M HCl. We noticed a pungent odor coming from the test tube. Conclusion When preparing the sodium thiosulfate pentahydrate, some of the product was lost in the production. As part of the experiment, we calculated the theoretical yield of the product and our percent yield. We saw that a 100% yield was not obtained. We determined that this could have been from some splattering that occurs naturally in the lab. Also the filtration process was not perfect, and some solution was lost there as well. These caused the percent yield to be lower than expected....
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This note was uploaded on 08/15/2008 for the course CHM U215 taught by Professor Lui during the Spring '08 term at Northeastern.

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Inorganic Synthesis - added 1 or 2 drops of 0.1 M iodine...

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