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Physical & Chemical properties

Melting point / freezing point

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Endpoint:
melting point/freezing point
Type of information:
other: handbook
Adequacy of study:
weight of evidence
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
data from handbook or collection of data
Remarks:
Handbook data are considered from a trusted source. Data have been taken from many sources, including both compilations and the primary literature - where conflicts were found, the value deemed most reliable was chosen. The reference was peer-reviewed. In addition, the reference sources are indicated although not leading to sufficient information on the material & method used.
Qualifier:
no guideline followed
Principles of method if other than guideline:
Method followed unknown; data from handbook.
GLP compliance:
not specified
Key result
Melting / freezing pt.:
ca. 100 °C
Decomposition:
yes
Decomp. temp.:
ca. 100 °C
Remarks on result:
other: dihydrate
Key result
Melting / freezing pt.:
ca. 95 °C
Decomposition:
yes
Decomp. temp.:
ca. 95 °C
Remarks on result:
other: hexahydrate

No melting temperature has been given for magnesium nitrate anhydrous.

Conclusions:
The CRC Handbook of Chemistry and Physics (80th ed.) mentions a melting/decomposition temperature of ca 95ºC and of ca 100ºC for magnesium nitrate hexahydrate and magnesium nitrate dihydrate, resp.
Endpoint:
melting point/freezing point
Type of information:
other: handbook
Adequacy of study:
weight of evidence
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
data from handbook or collection of data
Remarks:
Handbook data are considered from a trusted source. Data have been taken from many sources, including both compilations and the primary literature - where conflicts were found, the value deemed most reliable was chosen. The reference was peer-reviewed. In addition, the reference sources are indicated although not leading to sufficient information on the material & method used.
Guideline:
other: not mentioned
Principles of method if other than guideline:
Method followed unknown, data from handbook
GLP compliance:
not specified
Key result
Melting / freezing pt.:
ca. 95 °C
Remarks on result:
other: hexahydrate form
Melting / freezing pt.:
ca. 368 K

No melting temperature given for Magnesium nitrate anhydrous.

Conclusions:
The Merck Index (12th ed.) mentions a melting temperature of ca. 95°C for magnesium nitrate hexahydrate.
Endpoint:
melting point/freezing point
Type of information:
other: handbook
Adequacy of study:
weight of evidence
Reliability:
4 (not assignable)
Rationale for reliability incl. deficiencies:
documentation insufficient for assessment
Qualifier:
no guideline followed
Principles of method if other than guideline:
Method followed unknown; data from handbook.
GLP compliance:
not specified
Key result
Melting / freezing pt.:
129 °C
Remarks on result:
other: dihydrate
Key result
Melting / freezing pt.:
95 °C
Remarks on result:
other: hexahydrate

No melting temperature data for magnesium nitrate anhydrous.

Conclusions:
Melting temperatures taken from Sax's Dangerous Properties of Industrial Materials (9th. ed.):
Magnesium nitrate dihydrate: 129°C
Magnesium nitrate hexahydrate: 95°C

Description of key information

From the handbook results for the dihydrate and hexahydrate form of the substance, it was concluded that the melting/decomposition temperature of anhydrous magnesium nitrate should be > 100°C.

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
100 °C

Additional information

-The CRC Handbook of Chemistry and Physics (80th ed.): ca 95ºC and ca 100ºC for hexahydrate and dihydrate, resp.

-The Merck Index (12th ed.): ca. 95°C for hexahydrate.

-Sax's Dangerous Properties of Industrial Materials (9th. ed.): 95ºC and 129°C for hexahydrate and dihydrate, resp.