During a lab experiment, we were to determine the relative level of saturation b

Question

During a lab experiment, we were to determine the relative level of saturation by adding, drop by drop, a solution of bromine in cyclohexane to oil and a fat, individually. However, the color that is supposed to be retained due to unreacted bromine did not persist as it should have. It took a considerable amount of drops (around 300 or more) before we had to skip that portion of the experiment.

Considering that the oil and fat we used were both commercial grade (I do not remember the brands), how would I predict (mathematically?) the number of drops or volume of bromocyclohexane should have been needed?

Explanation / Answer

This expt is a special case of titration. I believe, you added the drops too quickly causing the change in color. Adding drops slowly, allows time to react. In chemical kinetics, a reaction can proceed under two very different pathways, if the rate of addition of a reactant is altered. They are called RCR & TCR (Rate controlled & thermodynamically controlled) pathways. The correct theoretical way, is to balance the reactants by equivalent weights. (you'll have error margin than if direct Mol wts are balanced)

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