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Physical & Chemical properties

Vapour pressure

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Administrative data

Link to relevant study record(s)

Reference
Endpoint:
vapour pressure
Type of information:
other: summary/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:
EU Method A.4 (Vapour Pressure)
Deviations:
not specified
Temp.:
20 °C
Vapour pressure:
214 Pa
Remarks on result:
other: 65% sulphuric acid
Temp.:
20 °C
Vapour pressure:
6 Pa
Remarks on result:
other: 90% sulphuric acid
Temp.:
148.5 °C
Vapour pressure:
130 Pa
Remarks on result:
other: 97% sulphuric acid

Vapour pressure 130 Pa @ 148.5°C (97% sulphuric acid).

At 20 °C, the vapour pressure was 6 Pa (90% sulfuric acid) and 214 Pa (65% sulphuric acid).

Conclusions:
Vapour pressure 130 Pa @ 148.5 °C (97% sulphuric acid). At 20 °C, the vapour pressure was 6 Pa (90% sulfuric acid) and 214 Pa (65% sulphuric acid).
Executive summary:

Vapour pressure130 Pa @ 148.5 °C (97% sulphuric acid). At 20 °C, the vapour pressure was 6 Pa (90% sulfuric acid) and 214 Pa (65% sulphuric acid).

Description of key information

The vapour pressure is dependent on the temperature and the concentration of sulfuric acid.

Key value for chemical safety assessment

Vapour pressure:
6 Pa
at the temperature of:
293 K

Additional information

At 20 °C the vapour pressure was

6 Pa for a 90% aqueous sulfuric acid solution

49 Pa for a 75% aqueous sulphuric acid

214 Pa for a 65% aqueous sulphuric acid solution

Tabulated below are the vapour pressure values for a range of concentrations of sulfuric acid. In the OECD SIDS, the concentration is not mentioned. However, as it is directly comparable to the result obtained by UK PSD at 148.5  °C the concentration of sulphuric acid in the OECD SIDS is most likely to be 97%.

Concentration of sulphuric acid (%)

Temperature (°C)

Vapour pressure (Pa)

Reference

65

20

214

a.

90

20

6

a.

97

148.5

130

a.

~97

20

<0.1

b.

~97

50

0.4

b

~97

145.8

130

b.

References;    a. UK PSD     b. OECD SIDS