Question 5 Answer all questions [20 marks in total]
Gas chromatograph was used in monitoring the reduction of nitrobenzene. A calibration curve was given based the table.
\begin{tabular}{|c|c|c|c|}
\hline aniline/mM & \begin{tabular}{l}
dodecane/mM \\
b.p.
\end{tabular} & \begin{tabular}{c}
Area \\
(aniline)
\end{tabular} & \begin{tabular}{c}
Area \\
(dodecane)
\end{tabular} \\
\hline 0.50 & 1.00 & 1503 & 5977 \\
\hline 0.75 & 1.00 & 2283 & 5843 \\
\hline 1.00 & 1.00 & 2987 & 5900 \\
\hline 1.25 & 1.00 & 3779 & 5905 \\
\hline 1.50 & 1.00 & 4500 & 5812 \\
\hline unknown & 1.00 & 3660 & 5783 \\
\hline
\end{tabular}
(a) Identify the peaks A, B and C. Justify your answer. (4 marks)
(b) Briefly explain how calibration curve was plotted from data of the table above. (5 marks)
(c) Calculate the unknown concentration in the table? Show your working. (4 marks)
(d) Suggest an extraction method for the separation of aniline from nitrobenzene. Justify your answer. ( 7 marks)
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