Category: Experimental
-
How does the iodine clock reaction work?
The iodine clock reaction times how long it takes for a fixed amount of thiosulphate ions to be used up, i.e. the time taken for the iodide ions to reach a fixed number of moles produced in the reaction between potassium iodide and an oxidising agent (usually hydrogen peroxide, or sodium peroxodisulphate). The system is…
-
Which factors determine the percentage yield in a laboratory preparation?
Experimental preparations of compounds usually follow the standard methodology, i.e. 1. reaction 2. work-up 3. purification The theoretical yield can be simply calculated froma knowledge of the stoichiometry of the reaction(s) involved in the preparation. The final percentage yield is calculated from actual yield/theoretical yield x 100% For example In the preparation of nitrobenzene by…