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Physical & Chemical properties

Dissociation constant

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Reference
Endpoint:
dissociation constant
Type of information:
other: Estimation by calculation
Adequacy of study:
key study
Study period:
Start date of the experimental work: 22 August 2014 and Completion date of the experimental work: 09 October 2014.
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: Estimation by calculation
Qualifier:
no guideline followed
Principles of method if other than guideline:
Experimental techniques are available for the determination of dissociation constant of a substance. These tests are described in OECD 112. They are Titration method, Spectrophotometric method and Conductometric method. The described tests cannot to be carried out because the substance, reacts with water, hence an estimation based on a calculation has been carried out.
GLP compliance:
no
Dissociating properties:
no
Temp.:
20 °C
Remarks on result:
other: 1159 cSt (mean of 2 runs)
Temp.:
40 °C
Remarks on result:
other: 178 cSt (mean of 2 runs)

Full test results.

 Run Temp. °C  Viscometer size  Calibration constant  Time (min)  Time (secs)  Viscosity (cSt) 
 1  20  7  2.787  6:57  417  1162.18
 2  20  7  2.787  6:55  415  1156.61
 3  40  4  0.1002  29:42  1782  178.56
 40  4  0.1002  29:24  1764  176.75

Comments.

Due to the nature of the test material, several runs were performed before consistent results were obtained at each test temperature. At 20°C a time of 324 sec, 356 sec and 311 secods were initially obtained from analysis with viscometer size 7. At 40°C a time of 1847 seconds was also obsrved from analysis with viscometer size 4.

Conclusions:
At 20°C 1159 cSt (mean of 2 runs)
At 40°C 178 cSt (mean of 2 runs)

Description of key information

Estimation method: Linear free energy relationship (LFER)

At 20°C 1159 cSt (mean of 2 runs)

At 40°C 178 cSt (mean of 2 runs)

Key value for chemical safety assessment

Additional information