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Physical & Chemical properties

Boiling point

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Reference
Endpoint:
boiling 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 103 (Boiling point/boiling range)
Deviations:
not specified
GLP compliance:
not specified
Boiling pt.:
290 °C
Atm. press.:
1 013 hPa
Remarks on result:
other: 100% sulphuric acid
Boiling pt.:
310 - 335 °C
Atm. press.:
1 013 hPa
Remarks on result:
other: 98% sulphuric acid

The boiling point (at 1013 hPa) is 290°C for 100% sulphuric acid and 310 to 335°C for 98% sulphuric acid.

Conclusions:
The boiling point (at 1013 hPa) is 290°C for 100% sulphuric acid and 310 to 335°C for 98% sulphuric acid.
Executive summary:

The boiling point (at 1013 hPa) is 290°C for 100% sulphuric acid and 310 to 335°C for 98% sulphuric acid.

Description of key information

The general trend seen in the three publications is that the boiling point increases as the acid strength increases to a maximum at around 97 -98%.  As the acid strength continues to rise to 100%, the boiling point value slowly falls.  

Key value for chemical safety assessment

Boiling point at 101 325 Pa:
290 °C

Additional information

The general trend seen in the three publications is that the boiling point increases as the acid strength increases to a maximum at around 97 -98%. As the acid strength continues to rise to 100%, the boiling point value slowly falls.

Largely differing values for the boiling point are presented for a 98% solution of sulfuric acid. However, the graph presented in the handbook titled 'The manufacture of Sulfuric Acid' supports the OECD value of 310 -335  °C.

Percent sulphuric acid H2SO4

UK PSD Boiling point (°C)

OECD Boiling point (°C)

100

-

290

98

190

310-335

96

330

-

77

365

-

70

163

-

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