prepgc - ga chromatography. 4. Why must the injection port...

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E XPE RI M E N T : P R E P A R A T I V E G AS C H R O M A T O G R A P H Y Name _______________________________________ Instructor ____________________________________ Chem ____________ Section/Color ______________ Date ________________________________________ Laboratory Questions These questions are to be completed and turned in at the beginning of the pre-lab period. PR E-L A B Q U EST I O NS 1. What types of samples cannot be analyzed by gas chromatography? 2. Give examples of gases that make suitable 'carrier gases'? 3. Explain how some s olid ampl e (compounds that are solids at room temperature) can be analyzed by
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Unformatted text preview: ga chromatography. 4. Why must the injection port and detector always be heated to higher temperatures than the column in a gas chromatograph? 1 pt 1 pt 2 pts 1 pt High-boiling compounds Aqueous Solutions Nitrogen, Neon, Argon Any two gets full credit The solids would have to be a gas at the oven/column temperature, and the solid would have to initially be dissolved in a solvent. The detector is hotter to ensure the volatile components will not cendense in the detector. The injection port is hotter to ensure the sample becomes vapoized and also to pre-heat the carrier gas....
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