Benzidine-2,2'-disulphonic acid

Endpoint summary

Additional information

Appearance/physical state/colour

Experimental results indicate the chemical benzidine-2,2'-disulphonic acid to be a pale yellow amorphous organic solid with no odour at 24oC and 990 hPa

Melting point/freezing point

Melting point of Benzidine-2,2’-disulphonic acid was estimated to be 277.18 deg C as per the Danish EPA database.

Boiling point

Boiling Point of Benzidine-2,2’-disulphonic acid was estimated to be 638.25°C accordng to the Danish EPA database

Density

The experimental value of the bulk density of benzidine-2,2'-disulphonic acid was found to be 0.774 g/cm3 at 24oC. The relative density at 20oC is equivalent to 0.645

Particle size distribution (Granulometry)

The particle size distribution (granulometry) of benzidine-2,2'-disulphonic acid by the sieve analysis method was found to be in the range of 75 micrometer to 300 micrometer. Majority of the particles were found to be in the size range of 75 to 150 micrometer in size.

Vapour pressure

Vapour pressure of Benzidine-2,2’-disulphonic acid was estimated as 3.24E-018 mm Hg at 25 deg C by Modified Grain Method. Thus, it can be concluded that the chemical has very low vapour pressure. This value when converted into Pascal is equivalent to 0.000000000000000431 Pa.

Partition coefficient

The experimental partition co-efficient value of benzidine-2,2'-disulphonic acid was found to be 12.66 (Log Pow = 1.102) at a temperature of 24oC and pH of 3.47

Water solubility

The water solubility of benzidine-2,2'-disulphonic acid was found to be 700 mg/L at 24oC and pH of 6.8. Thus, it is concluded that the chemical is moderately soluble in water.

Solubility in organic solvents / fat solubility

The solubility of benzidine-2,2'-disulphonic acid in methanol was found to be 1240 mg/L at 24oC. Thus, it is concluded that the chemical is soluble in methanol.

The solubility of benzidine-2,2'-disulphonic acid in petroleum ether was found to be 480 mg/L at 24oC. Thus, it is concluded that the chemical is moderately soluble in petroleum ether.

Surface tension

Surface Tension of Benzidine-2,2’-disulphonic acid was estimated to be 85.649002075 mN/m

Flash point

The flash point of benzidine-2,2'-disulphonic acid was not detectable upto 386oC in the experiment conducted. Thus, it is inferred that the chemical shall not have a tendency to flash.

Auto flammability

Benzidine-2,2'-disulphonic acid does not catch fire at room temperature and pressure. Thereby, it can be inferred that the chemical is not auto-flammable.

Flammability

The chemical benzidine-2,2'-disulphonic acid did not catch fire when the flame of bunsen burner having temperature of 950oC was brought in contact with it. Thus, it can be concluded that the chemical is non-flammable.

Explosiveness

This end point was considered for waiver since there are no chemical groups associated with explosive properties in the molecule of benzidine-2,2'-disulphonic acid. Thus, the chemical is considered to be non-explosive.

Oxidising properties

The chemical benzidine-2,2'-disulphonic acid was found to have mild oxidising property since 62.20 ml of KMnO4 was required to reach the end point of the redox titration. However, this oxidising property is very mild and does not classify the chemical as an oxidising solid.

pH

The pH of 1% solution of benzidine-2,2'-disulphonic acid was found to be 3.07 at 21oC. Thus, it can be concluded that the chemical is acidic.

Dissociation constant

The experimental average value of the dissociation constant of benzidine-2,2'-disulphonic acid was found to be 0.00002497 at 24oC. This value at 20oC is equivalent to 0.000002

Viscosity

The chemical benzidine-2,2'-disulphonic acid is a solid and since viscosity is an inherent property of liquids, this end point was considered for waiver