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Diphenhydramine, available in various salt forms, [73] such as citrate, [74] [75] hydrochloride, [76] and salicylate, [77] exhibits distinct molecular weights and pharmacokinetic properties. Specifically, diphenhydramine hydrochloride and diphenhydramine citrate possess molecular weights of 291.8 g/mol [ 78 ] and 447.5 g/mol , [ 79 ] respectively.
Boiling point (°C) K b (°C⋅kg/mol) Freezing point (°C) K f (°C⋅kg/mol) Data source; Aniline: 184.3 3.69 –5.96 –5.87 K b & K f [1] Lauric acid: 298.9 44 –3.9
The Gmelin rare earths handbook lists 1522 °C and 1550 °C as two melting points given in the literature, the most recent reference [Handbook on the chemistry and physics of rare earths, vol.12 (1989)] is given with 1529 °C.
Melting point: 60 °C (140 °F) ... Triprolidine is used less frequently and has been replaced in popular medications by other antihistamines like Diphenhydramine, ...
For example, the melting point of silicon at ambient pressure (0.1 MPa) is 1415 °C, but at pressures in excess of 10 GPa it decreases to 1000 °C. [13] Melting points are often used to characterize organic and inorganic compounds and to ascertain their purity. The melting point of a pure substance is always higher and has a smaller range than ...
Melting point 138 to 139 °C (280 to 282 °F; 411 to 412 K) ( hydrochloride ) Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Diphenylamine is produced by the thermal deamination of aniline over oxide catalysts: . 2 C 6 H 5 NH 2 → (C 6 H 5) 2 NH + NH 3. It is a weak base, with a K b of 10 −14.With strong acids, it forms salts.
Chloral hydrate is a geminal diol with the formula Cl 3 C−CH(OH) 2.It was first used as a sedative and hypnotic in Germany in the 1870s. Over time it was replaced by safer and more effective alternatives but it remained in usage in the United States until at least the 1970s. [4]