Question

In Lab 9 (Preperation of Cyclohexene), which of the following materials acts as the limiting reagent...

In Lab 9 (Preperation of Cyclohexene), which of the following materials acts as the limiting reagent ?

A.Cyclohexanol, 12 mL

B. Phosphoric Acid (H3PO4), 10 % solution, 2 mL

C.Sodium Carbonate, Na2CO3, 10 % solution, 2 mL

D. Sodium Sulfate, Na2SO4, anhydrous, granular, 2 g

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Answer #1

Limiting reagent in the reaction is the one which gets consumed totally and amount of product formed is decided by the quantity of limiting reagent.

The reaction of cyclohexanol with phosphoric acid gives cyclohexene and water molecule. Phosphoric acid acts as catalyst in the reaction and its quantity remains as it is at the end of reaction. Thus, phosphoric acid solution is not a limiting reagent.

Sodium carbonate is used to quench phosphoric acid in workup and sodium sulphate is used to dry the organic layer. Therefore, sodium carbonate solution and sodium sulphate cannot act as limiting reagents.

Thus, limiting reagent in given experiment is cyclohexanol. Therefore, correct option is A. Cyclohexanol, 12 mL

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