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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

Reference
Name:
Unnamed
Type:
Constituent
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