Why do you add the 6M hydrochloric acid to the reaction mixture from last week a

Question

Why do you add the 6M hydrochloric acid to the reaction mixture from last week at the start of this weeks' lab? 6. (2 pts.) Why do you hold the separatory funnel with the stopcock upwards when shaking? 7. (2 pts.) Why do you hold the separatory 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)? 8. (2 pts.) Petroleum ether is added before crystallizing the product. Characterize petroleum ether as polar or nonpolar and as protic or aprotic?

Explanation / Answer

Why do you add the 6M hydrochloric acid to the reaction mixture from last week at the start of this weeks' lab?

No background of the question is given.

6.

The stopper on top is imperative that it fits tightly, so that the solution does not leak out when the separatory funnel is inverted.

7.

We should hold the separatory funnel with one hand around the bottom of the flask with your thumb and forefinger on the stopcock handle, and with the other hand grasping the pennyhead of the stopper. To have better safety of our glassware and the compund in it.

8.

Petroleum ether consists of aliphatic hydrocarbons and boiling in the range 35-60 °C. Aliphatic hydrocarbons are nonpolar compounds and hence petroleum ether is nonpolar.

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