In the synthesis of 1-Bromobutane, during the purification process, the organic
ID: 490558 • Letter: I
Question
In the synthesis of 1-Bromobutane, during the purification process, the organic layer is washed with 2M NaOH and then with saturated sodium chloride solution. What is the purpose of each wash?? After separating the organic layer, it is treated with anhydrous sodium sulfate. Why it is done?? When setting up a reflux or distillation at what end should the water enter the condenser? Why is it necessary to run a blank when using the IR? Explain the use of a) boiling stones b) charcoal c) allyl alcohol, d) Concentrated HCl during the synthesis of para-Nitrobenzoic Acid. During the synthesis of para-Nitrobenzoic Acid, if you remember, a dark brown solid was obtained which you collected over filter paper and discarded. What is that brown solid? Write its name and formula.Explanation / Answer
Q17
the wash of NaOH is to ensure all material has reacted (i.e. the acid leftoer is reacted)
the saturated NaCl solution is to increase ionic strength, therefore precipitates form easier
Anhydrous Na2SO4 is a strong dissicant, i.e. a drying agent
Q18
The filter should be cleaned first, then we add the paper filter; evnetually, we filter it via vaccum, then after we finish (all liquid is partially gone) we take the solid from the filter and weight it
Q19
Water always enters in the inlet of the column. Should avoid to be connected in the beaker where the reactants are present, so we avoid mixing
Q20
In order to ensure IR is working properly and no other material is present
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