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Cheryl Foudji

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TCDD can also be analysed using 13C n.m.r. 4 (d) (i) Give the formula of the compound used as the standard when recording a 13C spectrum
Si(CH3)4 TMS
The 1 H n.m.r. spectrum was recorded using a solution of atenolol in CDCl3
Suggest why CDCl3 and not CHCl3 was used as the solvent.

Solvent must be proton-free OR CHCl3 has protons or has H or gives a peak
Suggest why CDCl3 is a more effective solvent than CCl4 for polar molecules such as atenolol.
CDCl3 is polar OR CCl4 is non-polar
Give two other reasons why TMS is used as a standard in recording n.m.r. spectra
Single/one (intense) peak/signal
Low bp OR volatile

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NMR

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