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Physical & Chemical properties

Melting point / freezing point

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Reference
Endpoint:
melting point/freezing point
Type of information:
other: review
Adequacy of study:
weight of evidence
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Summary of public domain information
Qualifier:
equivalent or similar to guideline
Guideline:
OECD Guideline 102 (Melting point / Melting Range)
Deviations:
not specified
GLP compliance:
not specified
Melting / freezing pt.:
3 °C
Remarks on result:
other: 98% sulphuric acid
Melting / freezing pt.:
10.4 - 10.5 °C
Remarks on result:
other: 100% sulphuric acid

The melting point was found to be 10.4 to 10.5°C for 100% sulphuric acid and 3°C for 98% sulphuric acid.

Conclusions:
The melting point was found to be 10.4 to 10.5°C for 100% sulphuric acid and 3°C for 98% sulphuric acid.
Executive summary:

The melting point was found to be 10.4 to 10.5°C for 100% sulphuric acid and 3°C for 98% sulphuric acid.

Description of key information

The melting point varies with the acid strength.  

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
10.67 °C

Additional information

The melting point of sulfuric acid varies with the strength of the acid. Tabulated below are the melting point values for a range of strengths. The values generated by UK PSD and the Sulfuric Acid handbook are comparable. However, in the case of the OECD SIDS, the value for a 78%, 74% and 65% are -38, -44 and -64  °C respectively which does not match with values obtained/noted by UK PSD and the Sulfuric Acid Handbook.

Percent sulphuric acid H2SO4

Melting point range (°C)

Source

100

10.4 to 10.94

Ref 1 and 3

98

-1.11 to 3.0

Ref 1-3

96

-13.89 to -10

Ref 1 and 3

93

-32.0 to-29.44

Ref 2 and 3

83

7.56

Ref 3

77

-15 to -11.39

Ref 1 and 3

65

-36.78

Ref 3

References

1. UK PSD

2. OECD SIDS

3. Sulfuric acid Handbook, 2007