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Find the theoretical yield of both reactions MW=183.12 NOTE: these amounts of 2,4-dinitrohalobenzene will be divided between two test tubes as per he procedure below.
Find the theoretical yield of both reactions
MW=183.12 NOTE: these amounts of 2,4-dinitrohalobenzene will be divided between two test tubes as per he procedure below. Please keep this in mind for limiting reagent calculations. 1. In a small test tube (No. 1), add 0.06g of 2,4-dinitrochlorobenzene and 1mL of ethanol. Swirl the test tube to dissolve the crystals of the 2,4-dinitrochlorobenzene; slight warming may be necessary to dissolve the crystals completely. 2. Use a pipette to transfer half of the solution to another test small test tube (No. 2). 3. To another test tube (No. 3) have a Teaching Assistant add 0.04mL of 2,4dinitrofluorobenzene and 1mL of ethanol. Swirl to dissolve. Make sure all the oily 2,4dinitrofluorobenzene has dissolved. *NOTE: this material is a cancer suspect agent and a low melting solid (mp 2527C) and may have to be warmed in its container to obtain a liquid which can be withdrawn into a syringe. 4. Once dissolved, transfer half of this solution to another test tube (No. 4). 5. To each of test tubes No. 1 and No. 3, add 0.02mL of concentrated ammonium hydroxide (caution: irritant), swirl to mix completely. Note the exact time of addition and record any changes that occur in the tubes over the next 30 minutes (precipitate formation, color changes). 6. To each of test tubes No.2 and No. 4, have a Teaching Assistant add 0.02mL of 80% hydrazine hydrate (caution: suspected carcinogen), note the exact time of addition and record any changes that occur in the tubes over the next 30 minutes (precipitate formation, color changes). 7. After 30 minutes collect any crystalline products which formed using vacuum filtration. Use cold ethanol to wash the product out of the test tubes and then air dry each of the collected solids by sucking air through the crystals until dry. Weigh the solids and calculate the % yields of the products, assuming the dinitrohalobenzenes are the limiting reagentsStep by Step Solution
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