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Properties of substance:

benzylpenicillinic acid

Group of substances:

organic

Physical appearance:

white amorphous powder

Empirical formula (Hill's system for organic substances):

C16H18N2O4S

Molar/atomic mass: 334.3901

Melting point (°C):

186-191

CAS №: 61-33-6

Solubility (g/100 g of solvent):

acetone: soluble [Ref.]
benzene: soluble [Ref.]
chloroform: soluble [Ref.]
diethyl ether: soluble [Ref.]
ethanol: soluble [Ref.]
ethyl acetate: soluble [Ref.]
methanol: soluble [Ref.]
petroleum ether: insoluble [Ref.]
water: 0.2675 (25°C) [Ref.]

Dissociation:

pKa (1) = 2.74 (5°C, water)
pKa (1) = 2.76 (25°C, water)
pKa (1) = 4.84 (5°C, ethanol 80%)

References:

  1. Armarego W. L. F. Purification of Laboratory Chemicals. - 7ed. - 2013. - pp. 863
  2. The Merck Index 11th ed., Merck & Company, 1989. - pp. 178
  3. Yalkowsky S.H., Yan H., Jain P. Handbook of aqueous solubility data. – 2nd ed. - CRC Press, 2010. - pp. 1101
  4. Пассет Б.В., Воробьева В.Я. Технология химико-фармацевтических препаратов и антибиотиков. - М.: Медицина, 1977. - pp. 372 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru