Pka Values Answers

question

[image][image]

answer

20
question

HI
answer

-10
question

HCl
answer

-7
question

H2SO4
answer

ca. -3
question

HSO4
answer

2.0
question

[image]
answer

4.8
question

H2S
answer

7.0
question

NH4+
answer

9.2
question

[image]
answer

10.0
question

phenol
answer

10
question

acetone
answer

20.0
question

methanol
answer

15.5

 

question

CH3OH
answer

15.5
question

[image]
answer

25
question

alkyne
answer

25
question

NH3
answer

33
question

ammonia
answer

33
question

C6H6
answer

ca. 43
question

benzene
answer

43
question

CH4
answer

ca. 48
question

 methane
answer

ca. 48
question

ethyne
answer

25
question

will ammonia deprotonate ethylene?
answer

yup. ammonia pKa 33, ethylene pKa 25

it’s the amide ions that will deprotonate the ethylene, not ammonia itself

question

pKas of:

ethane,

ethene,

ethylene

answer

50,

44,

26

question

;

[image] ,; [image],;[image]

;

answer

15.9, 4.8, -1.9

The trend is due to the fact that the respective conjugate bases get more stable for compounds left to right bc of nr of O atoms. pretty cool

question

why does ethane has higher pKa than ethene?
answer

Upon the removal of H from ethane, the e will stay in an sp3 orbital, which is less stable than an sp2 orbital resulting from deprotonation of ethene.
question

Are e in sp or sp2 orbitals lower in energy?
answer

sp, because an sp orbital has more s character than an sp2 orbital. An s orbital is more stable bc s orbitals are closer to the nucleus and very low in energy

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