You must turn this paper in to your TA at the start of the NEXT LABI If you did

Question

You must turn this paper in to your TA at the start of the NEXT LABI If you did not collect any data or are missing some data to complete this post-lab, then give your source of data here and give a brief explanation why you have missing data. If you use your own data you can go straight to question 1, no need to add anything here. Why are the ether layers washed using BRINE (a saturated solution of salt in water) instead of just plain water? Sodium sulfate is used to dry the ether solutions. What are the intermolecular forces that help the sodium sulfate to dry the ether? Why do you place rubber septa on the reaction vessels for this synthesis? Why do you keep the syringe stored with the needle inserted into a septum when it is not in use always? Why do you add the 6M hydrochloric acid to the reaction mixture from last week at the start of this weeks' lab? Why do you hold the separator funnel with the stopcock upwards when shaking? Why do you hold the separator funnel with 2 hands when shaking, particularly with the stopper resting in one of the hands (this is not a trick question, the answer is very basic and obvious)? Petroleum ether is added before crystallizing the product. Characterize petroleum ether as polar or

Explanation / Answer

Dear candidate you have posted eight question without mentioning which one you want be solved. Here we solve first few questions. Please send others separately.

Q1. The ether layer is washed with brine, because brine has the least capacity to dissolve a compound as it is already saturated. As a result brine will not take compound with while washing. However plan water may take away some compound with it while washing resulting in less yield.

Q2. Sodium sulphate is hygroscopic in nature HENCE REMOVES MOISTURE FROM ETHER LAYER. Sodium sulphate bond with water molecules by HYDROGEN-BONDS.

Q3. Rubber Septa are used to avoid atmospheric intervention by making our system air tight.

Q4. The syringe stored with needle is used to remove the gases from our reaction vessel if produced.

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