Pka Values Answers – Flashcards
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[image][image] |
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| 20 |
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| HI |
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| -10 |
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| HCl |
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| -7 |
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| H2SO4 |
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| ca. -3 |
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| HSO4- |
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| 2.0 |
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| [image] |
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| 4.8 |
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| H2S |
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| 7.0 |
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| NH4+ |
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| 9.2 |
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| [image] |
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| 10.0 |
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| phenol |
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| 10 |
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| acetone |
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| 20.0 |
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| methanol |
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15.5
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| CH3OH |
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| 15.5 |
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| [image] |
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| 25 |
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| alkyne |
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| 25 |
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| NH3 |
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| 33 |
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| ammonia |
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| 33 |
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| C6H6 |
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| ca. 43 |
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| benzene |
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| 43 |
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| CH4 |
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| ca. 48 |
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| methane |
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| ca. 48 |
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| ethyne |
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| 25 |
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| will ammonia deprotonate ethylene? |
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yup. ammonia pKa 33, ethylene pKa 25 it's the amide ions that will deprotonate the ethylene, not ammonia itself |
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pKas of: ethane, ethene, ethylene |
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50, 44, 26 |
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; [image] ,; [image],;[image] ; |
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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 |
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| why does ethane has higher pKa than ethene? |
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| 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. |
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| Are e in sp or sp2 orbitals lower in energy? |
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| 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 |
