水杨酸 salicylic acid

物理描述 Physical Description

Solid

颜色/状态 Color/Form

White crystals, fine needles, or fluffy white crystalline powder

气味 Odor

SYNTHETIC ACID IS ODORLESS

味道 Taste

Acrid taste

沸点 Boiling Point

211 °C at 20 torr

熔点 Melting Point

158°C

闪点 Flash Point

315 °F (157 °C) (closed cup)

溶解度 Solubility

2.24 mg/mL at 25 °C

密度 Density

1.443 g/cu cm at 20 °C/4 °C

蒸气密度 Vapor Density

4.8 (Air= 1)

蒸汽压力 Vapor Pressure

8.2X10-5 mm Hg at 25 °C

亨利常数 Henry'S Law Constant

Henry's Law constant = 7.3X10-9 atm-cu m/mole at 25 °C (est)

稳定性/保质期 Stability/Shelf Life

GRADUALLY DISCOLORS IN SUNLIGHT

自燃温度 Autoignition Temperature

1004 °F (540 °C)

分解 Decomposition

When heated to decomp it emits acrid smoke and irritating fumes.

腐蚀性 Corrosivity

Non-corrosive

燃烧热 Heat Of Combustion

3.026 millijoules/mole

折光率 Refractive Index

Index of refraction: 1.565 at 25 °C/D

解离常数 Dissociation Constants

pKa1 = 2.98 at 20 °C (carboxylic acid); pKa2 = 13.6 (phenol)

保留指数 Kovats Retention Index

1308 ;1308 ;1330 ;1266 ;1277 ;1296 ;1305 ;1291 ;1263 ;1308 ;1330 ;1330

其他实验性质 Other Experimental Properties

Hydroxyl radical reaction rate constant = 1.3X10-11 cu cm/molecule-sec at 25 °C (est)

辛醇/水分配系数 LogP

2.26

水溶性 Logs

-1.82

辛醇/空气分配系数 Logkoa

7.44 (Octanol-Air partition coefficient)

氢离子浓度指数 pH

pH of saturated solution: 2.4

Caco2细胞的药物渗透性 Caco2 Permeability

-4.79

碰撞截面 Collision Cross Section

123.36 Ų [M-H]- [CCS Type: DT, Method: stepped-field]

化学类 Chemical Classes

Other Classes -> Benzoic Acid Derivatives