NH_2(CH_2)_5NH_2 (b.p. 179), butane-1, 4-diol (b.p. 235) a. easier to rotate in
ID: 500311 • Letter: N
Question
NH_2(CH_2)_5NH_2 (b.p. 179), butane-1, 4-diol (b.p. 235) a. easier to rotate in place 2, 2-dimethylpropane-1, 3-diol (b.p. 208), pentane-1, 5-diol (b.p. 242) b. greater weight butan-1-ol (b.p. 118), CH_3(CH_2)_3 I (b.p. 131) c. more hydrogen bonds pentane-1, 5-diol (m.p. -18), 2, 2-dimethylpropane-1, 3-diol (m.p. 129) d. more polar bonds pentane-1, 5-diol (m.p.-18), NH_2 (CH_2)_5 NH_2 (m.p.12) e. more van der Wall interactions Using the method that we learned in class to estimate specific gravities and given the following atomic weights (C = 12, H = 1, N = 14, O = 16), which compound has a density closest to that of water? Compound 6. e. will? a. sink in water b. make an emulsion with water c. float on water d. dissolve in water e. not a.-d To the nearest tenth, what is the pH of a 1.0 M solution of trifluoroacetic acid (CF_3CO_2H) with a pK_a 0.2? a.0.9 b. 0.7 c. 0.5 d. 0.3 e. not a.-d. Given (from left to right) the pK_as of salicylic acid (aspiring precursor), sodium bicarbonate, sodium salicylate, and carbonic acid; use the correct pK_as to determine the concentration of carbonic acid produced (to the nearest hundredth) from 1.0 M concentrations of both starting materials. The subscripts on the oxygens are for the next question. a. 0.99 b. 0.97 c. 0.95 d. 0.93 e. not a, -d.Explanation / Answer
6) Among the given compounds, the one which is more polar would have a density closest to water (water being polar),
c.
7. The compound 6e being less polar and more organic type than water (hydrophobic) would,
c. float on water
8. pH of 1 M solution of trifluoroacetic acid
let HA represent the acid
HA <==> H+ + A-
with x amount dissociated
Ka = [H+][A-]/[HA]
0.631 = x^2/(1 - x)
x^2 + 0.631x - 0.631 = 0
x = [H+] = 0.54 M
pH = -log[H+] = 0.3
Answer : d. 0.3
9. given the Kow of aspirin the amount of aspirin extracted would be,
c. 0.5
10. The reaction of salicylic acid with sodium bicarbonate is fully complete and we get 1 mole of carbonic acid formed,
a. 0.99
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