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![Page 1: Jump to first page Precipitate Formation: Cobalt(III)Saccharinate Hexahydrate Two solutions are combined to form a precipitate. Connie Giroux Chemistry](https://reader036.vdocument.in/reader036/viewer/2022083009/5697bff61a28abf838cbdfed/html5/thumbnails/1.jpg)
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Precipitate Formation: Cobalt(III)Saccharinate Hexahydrate
Two solutions are combined to form a precipitate.
Connie Giroux
Chemistry Outreach
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Purpose The solubility and insolubility of cobalt
salts is demonstrated
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Demonstration Sodium saccharinate and cobalt chloride
hexahydrate are extremely soluble in distilled water, but when combined, they produce an insoluble product, cobalt(III)-saccharinate hexahydrate.
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Concepts Double-replacement reactions Solubility Precipitates
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Double-replacement Reactions
In the reaction below, the double-replacement reaction occurs when the cobalt ion replaces the sodium ion producing a solid, and the sodium ion replaces the cobalt ion in solution.
General form of a double replacement reaction isAB + CD AD + CB
CoCl2.6H2O(aq) + C7H4NNaO3S.2H2O
Co(C7H4NO3S)2.6H2O (s) + 2H2O + Na+ + Cl-
This is also known as a metathetical reaction.
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Solubility Solubility refers to the amount of a solid
that dissolves in a solvent. In this demonstration, the solvent used
was distilled water which completely dissolved the solutes which were sodium saccharinate and cobalt chloride solids, indicating that they were highly soluble. The sodium saccharinate solution was also heated to ensure that the Na+ and Cl- ions would remain in solution when combined.
When the two solutions were combined, the solid, cobalt(III)saccharinate hexahydrate, was produced which is highly insoluble in distilled water.
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Precipitates Precipitation refers to a substance that
leaves a solution rapidly in the form of a solid known as a precipitate
In this demonstration, cobalt(III)-saccharinate hexahydrate precipitated out of the solution forming a pink solid, while the Na+ and Cl- ions remained in solution.
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Conclusion Sodium saccharinate and cobalt chloride
hexahydrate were completely dissolved in distilled water to form two solutions.
When combined, these solutions produced an insoluble product, cobalt(III)saccharinate hexahydrate.
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Comments Researchers have been studying
saccharin and its effects on human metabolism for many years. The addition of cobalt to the saccharin complex is also being study to see what effects, if any, that it also has.