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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Physical & Chemical properties

pH

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Administrative data

Endpoint:
pH
Type of information:
migrated information: read-across from supporting substance (structural analogue or surrogate)
Adequacy of study:
key study
Study period:
1953
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: No GLP, no guidelines followed Read across from a similar substance which has the same main component and with a different counter ion that doesn't influence the characteristics related to the specific end-point

Data source

Referenceopen allclose all

Reference Type:
secondary source
Title:
Unnamed
Year:
1957
Report date:
1969
Reference Type:
other: originary study
Title:
On the dissociation of the triarylcarbinol
Author:
Ginzburg O.F.
Year:
1953
Bibliographic source:
J. Gan. Chem. USSR, 23, (1953), 9, 1504-1509

Materials and methods

Principles of method if other than guideline:
Having produced in chemically pure form hydrobromide salts of Malachite Green, it was determined the pH's of its aqueous solution at temperature 19 ± 1°C. Then a weighed sample of the substance is dissolved in 70 ml of 60% aqueous acetone, added 0.5 equivalents of NaOH and was determined the solution pH .
GLP compliance:
not specified

Test material

Constituent 1
Reference substance name:
Malachite Green Hydrobromide
IUPAC Name:
Malachite Green Hydrobromide
Details on test material:
- Name of test material: hydrobromide of Malachite Green

Results and discussion

pH valueopen allclose all
pH value:
ca. 4.95
Temp.:
19 °C
Concentration:
ca. 0.001 other: mol/L
Remarks on result:
other: Calculated for 25°C: 4.86
pH value:
ca. 5.02
Temp.:
19 °C
Concentration:
ca. 0.001 other: mol/L
Remarks on result:
other: Calculated for 25°C: 4.94

Any other information on results incl. tables

Sample in water

Dissolved salt Sample [g] Concentration[mole/L) Quantity of water [ml] pH found pH calculated for 25°C
Hydrobromide of Malachite Green 0.0607 1.48 x 10 -3 100 4.95 4.86
Hydrobromide of Malachite Green 0.0481 1.05 x 10 -3 100 5.02 4.94

Sample in aqueous solution

Dissolved salt Sample[g] 0.1 n solution added; NaOH[ml] pH
Hydrobromide of Malachite Green 0.0588 0.72 6.05

Applicant's summary and conclusion

Conclusions:
pH's aqueous solution of Hydrobromide of Malachite Green at 19°C ± 1°C: 4.95 a Conc. of 1.48 x 10^-3 mole/L; 5.02 a Conc. of 1.05 x 10^-3 mole/L.
Executive summary:

Having produced in chemically pure form hydrobromide salts of Malachite Green, it was determined the pH's of its aqueous solution at temperature 19 ± 1°C.

Then a weighed sample of the substance is dissolved in 70 ml of 60% aqueous acetone, added 0.5 equivalents of NaOH and was determined the solution pH .

Results:

Aqueous solution of Hydrobromide of Malachite Green at 19°C ± 1°C:

4.95 a Conc. of 1.48 x 10^-3 mole/L

5.02 a Conc. of 1.05 x 10^-3 mole/L

Aqueous acetone of Malachite Green at 19°C ± 1°C:

6.05 a conc. 0.0588 g in 0.72 ml of NAOH