Properties: Monoclinic prisms from ether or dil HCl. d420 1.485; d4100 1.2797. mp 97°. bp70 194°. Dec when distilled at ordinary pressure. pK (18°) 8.34. Absorption spectrum: Baly et al., J. Chem. Soc.
97, 586 (1910); Marchlewski, Moroz, Bull. Soc. Chim. [4]
35, 476 (1924). An aq soln satd at 40℃ontains 3.02 g in 100 g soln; at 98.7°, 40.9 g: Sidgwick et al., J. Chem. Soc.
107, 1202 (1915). Soly (g/100 g solvent) in acetone: 169.35 (0.2°); 1305.9 (84°); in alcohol: 116.9 (1°); 1105.25 (85°); in ether: 105.9 (0.2°); 1065.8 (83°): Carrick, J. Phys. Chem.
25, 635 (1921). Sol in hot and dil acids, in caustic solns. Insol in petr ether. LD50 orally in mice, rats: 1414, 933 mg/kg, K. C. Back et al., Reclassification of Materials Listed as Transportation Health Hazards (TSA-20-72-3; PB214-270, 1972).
Melting point: mp 97°
Boiling point: bp70 194°
pKa: pK (18°) 8.34
Density: d420 1.485; d4100 1.2797
Toxicity data: LD50 orally in mice, rats: 1414, 933 mg/kg, K. C. Back et al., Reclassification of Materials Listed as Transportation Health Hazards (TSA-20-72-3; PB214-270, 1972)
Use: As indicator in 0.3% soln in 50% alc. pH: 6.8 colorless, 8.6 yellow.
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