With a pKa of 1.2, squaric acid is unusually acidic for a compound containing only C, H, and O. :ÖH ö: Squaric acid :ОН

Weak Base NH (CH) N (CH3)2NH H₂NNH₂ Which one of the following is the strongest weak base? A NH3 Kb B 1.8 x 10-5 (CH3) N 6.4 x 10-5 5.4 x 10-4 C (CH3)2NH 1.3 x 10-6 D H₂NNH₂

Rank the organic molecules in order of increasing acidity. 80 F3 4 R DOD 000 F4 F % ABA: 5 6 T F5 G MacBook Pro F6 Y H & 7 ◄◄ F7 U J Least acidic CH₂CH₂OH, pka=15 C6H₂OH, pK₂=9.9 CH₂COOH, pK₂=4.76 CH3COCH₂, pKa=19.3 Most acidic * 00 Answer Bank 8 DII F8 | ( 9 K F9 O O F10 L P e F11

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Rank the substances identified by letters a-d in order of acidity, 1-most acidic to 4=least acidic. -OH Bisulfate (pK₂=2.0) a The acidity rank of a is The acidity rank of bis 1234 The acidity rank of c is The acidity rank of d is 3 H₂C-CH₂-OH Ethanol (pK, =16.0) b H-C=C-H Ethyne (PK, 25.0) C H₂S Hydrogen sulfide (pk,=7.0)

If a diprotic acid, H2A, has a pK1 = 2.20 and pK2 = 9.31, what is the principal species of this compound at pH = 5.13? O H2A O A2- OHA O H3A+