Reference number
ISO 910:1977
ISO 910:1977
© ISO 2025
International Standard
ISO 910:1977
Sulphuric acid and oleum for industrial use — Determination of total acidity, and calculation of free sulphur trioxide content of oleum — Titrimetric method
Edition 1
1977-11
1977-11
ISO 910:1977
5315
Published
(Edition 1, 1977)
This publication was last reviewed and confirmed in 2025.
Therefore this version remains current.
Abstract
Two cases are considered: sulphuric acid contents equal to or lower than 98 % (m/m) and sulphuric acid contents higher than 98 % (m/m). The principle is based on oxidation of a test portion with hydrogen peroxide and titration of the total acidity with a standard volumetric sodium hydroxide solution, in the presence of methyl red as indicator. - Replaces ISO Recommendation R 910-1968.