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EC number: 231-639-5 | CAS number: 7664-93-9
Melting point / freezing point
Administrative data
Link to relevant study record(s)
- 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
- 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.
Reference
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
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