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| BoilingPtC = 178
| BoilingPtC = 178
| Boiling_notes = [[sublimation (chemistry)|subl.]]
| Boiling_notes = [[sublimation (chemistry)|subl.]]
| pKa = -0.13–1.22 protonated caffeine<ref name="pKa">This is the pK<sub>a</sub> for protonated caffeine, given as a range of values included in {{cite book |title=Profiles of Drug Substances, Excipients and Related Methodology, volume 33: Critical Compilation of pK<sub>a</sub> Values for Pharmaceutical Substances |author=Harry G. Brittain, Richard J. Prankerd |publisher=Academic Press |year=2007 |isbn=0-12-260833-X |url=http://books.google.com/?id=D3vBu5Tx4XwC&pg=PT15&lpg=PT15}}</ref>
| pKa = -0.13–1.22 protonated caffeine<ref name="pKa">'''Harry G. Brittain, Richard J. Prankerd'''<br>Profiles of Drug Substances, Excipients and Related Methodology, volume 33: Critical Compilation of pK<sub>a</sub> Values for Pharmaceutical Substances<br>''Academic Press'', 2007</ref>
| Dipole = 3.64 [[debye|D]] (calculated)
| Dipole = 3.64 [[debye|D]] (calculated)


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