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Physical & Chemical properties

Melting point / freezing point

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Reference
Endpoint:
melting point/freezing point
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Justification for type of information:
Experimental test result performed using standard test guidelines
Qualifier:
according to
Guideline:
other: as mention below
Principles of method if other than guideline:
The freezing point of a pure sample is determined by making measurements of the temperature as a function of time while the sample is submerged in a constant temperature bath at a temperature below that of the expected freezing point of the sample. The data (Temperature vs. time) is plotted; this plot is known as a cooling curve. The freezing point is the value of temperature in the flat portion of the curve.
GLP compliance:
no
Type of method:
other: Method according to Cooling Curve
Key result
Melting / freezing pt.:
-9.79 °C
Atm. press.:
947.9 hPa
Decomposition:
no
Sublimation:
no

Observation Table & Result :

 Method Details    Observations
 Method Freezing Temperature Method  
 Principle of method

 The freezing point of a pure sample is

the temperature at which transition from liquid to

solid state takes place at atmospheric pressure.

 

Quantity of test item used

g

 1 ml

 Type of cooling bath used

  1. Cold Water
  2. Crushed Ice
  3. Crushed Ice-Salt
  4. Dry Ice
  5. Other (specify)

 

Crushed Ice-

Salt

Type and model no. of temperature sensor used

  1. Glass thermometer
  2. Thermocouple
  3. Thermistor
  4. Other (specify)

Glass

thermometer

Atmospheric pressure

hPa

 974.9 hPa

 Freezing point °C

 °C

 -9.79 °C

Conclusions:
The Mean Freezing point of test chemical by cooling curve method was determined to be -9.79 °C at 974.9 hPa.
Executive summary:

The Freezing point determination of test chemical was done using crushed ice and salt. The determination was done on the basis of cooling curve (time vs temperature) obtained when the test item was placed in the cooling bath. The freezing point was observed to be -9.79 °C at 974.9 hPa.

Description of key information

The Mean Freezing point of test chemical by cooling curve method was determined to be -9.79 °C at 974.9 hPa.

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
-9.79 °C

Additional information

The Freezing point determination of test chemical was done using crushed ice and salt. The determination was done on the basis of cooling curve (time vs temperature) obtained when the test item was placed in the cooling bath. The freezing point was observed to be -9.79 °C at 974.9 hPa.