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exam specific answers (NMR)
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Total cards: 2•Content version: v4•Public deck•Updated: 8/1/2026
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#1
Front (Question)
give an equation for the reaction of C4H9COOH with sodium hydrogencarbonate. (1)
Back (Answer)
C4H9COOH + NaHCO3 -> C4H9COONa + CO2 + H2O
#2
Front (Question)
state why Si(CH3)4, CCl4 and CDCl3 are used in 1H NMR spectroscopy, and explain how their properties make them suitable for use in 1H NMR spectroscopy. (6)
Back (Answer)
• CDCl3 and CCl4 as solvent • TMS as standard • inert so unlikely to react with sample CCl4/CDCl3: * both have no H atoms so give no signal in spectrum * CCl4 non-polar so good for non-polar molecules * CDCl3 polar covalent so good for polar molecules TMS: * gives one signal * signal in area away from other typical H signals * easy to remove due to low boiling point