CHEM 211 Lecture Notes - Lecture 8: Conjugate Acid, Sodium Hydroxide, Wavenumber
24 Sep 2016
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Position of an absorption band (peak) in an ir specter is speci ed in units of wavenumbers (v) Bonds aren"t stagnant, they vibrate, stretch, twist, bend, and all of those motions are caught by ir: things start vibrating when ir frequencies run through them. Basics: x axis is always in wavenumber (1/wavelength in centimeters) Ngerprint region = irrelevant for this course because it is dif cult: y axis is transmittance. Alkanes = don"t pass 3000, are found below 3000. Alkynes = peak at 3300: terminal triple bonds are easier to spot compared to triple bonds in the middle. Carbonyl (c=o) functional groups: carbonyl peaks at 1750. Degrees of unsaturation: will be bonus question on test. Lecture #8: acids and bases in organic chemistry ii. Acidity and pka: pka = -log ka, lower the pka, stronger the acid. higher the ka, stronger the acid, vice versa.
