Question 5 1 pts Para-fluorophenylacetic acid (structure shown below) is an inte

Question

Question 5 1 pts Para-fluorophenylacetic acid (structure shown below) is an intermediate used in the manufacturing of fluorinated anesthetics. Pure para-fluorophenylacetic acid (mp 86 °C; recrystallized from chloroform) is a colorless crystalline material at room temperature. ?? What voltage should be used when a melting point determination is performed on para-fluorophenylacetic acid? Please round your final answer to a whole integer value (e.g. 23). Do not include units. wnar pois medon your finalanswer toa wholeintegervaluatinis Question 6 1 pts In principle is a melting point of 99 °C consistent with a sample of para-fluorophenylacetic acid contaminated with a small quantity of E,E-dibenzylideneacetone (EE-DBA)? Pure EE-DBA has a melting point of 110- 111 °C O Yes O No

Explanation / Answer

If heating rate is 2 o C/min then set voltage is 32V

If heating rate is 4 oC/min, then set voltage is 35V

If heating rate is 6 oC/min, then set voltage is 38V

The melting point determination is one of the technique for determination of impurity of the sample. In the presence of an impurity in the minor quantity, the melting point of the sample will have fluctuated depends upon impurity melting point. Here pure para-fluorophenyllacetic acid has 86 oC melting point. But in the presence of E,E-dibenzylideneacetone impurity which is having a higher melting point around 110-111 oC, the melting point of para-fluorophenyllacetic acid has increased upto 99 oC.

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