These are strings of an insoluble compound falling out of solution after a chemical reaction. The strings develop because the precipitate dissociates from the solution faster than the precipitate falls to the bottom of the reaction vessel.
Precipitates are formed in double displacement reactions, where two aqueous solutions react to form an insoluble solid compound. This solid then precipitates out of solution.
Precipitates can be formed in a precipitation reaction when two soluble compounds react to form an insoluble product, which then precipitates out of solution. This can occur when the product is a solid that is not soluble in the solvent present, leading to its separation from the solution as a precipitate.
Crystalline precipitates have less surface area than the colloidal precipitates, therefore they are more pure. Additionally, crystalline precipitates, because they are larger, are more easily separated from the surrounding solution.
The common reaction that forms precipitates is a double displacement reaction, where two aqueous solutions react to form a solid product that is insoluble in water and falls out of solution as a precipitate.
The compound is likely a ketone. Ketones do not react with Fehling's or Tollens' reagent to form precipitates, unlike aldehydes which would undergo redox reactions resulting in a visible change.
Napoleon Cordy was born in 1902.
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