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Ref. No.: ISO/R 740-1968 (E)
IS0
I NTERN AT1 ON A L O RG A N IZATl O N FOR STA N DARD IZATION
IS0 RECOMMENDATION
R 740
SODIUM CARBONATE FOR INDUSTRIAL USE
DETERMINATION OF TOTAL SOLUBLE ALKALINITY
VOLUMETRIC METHOD
1st EDITION
May 1968
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For each individual country the only valid standard is the national standard of that country.
Printed in Switzerland
Also issued in French and Russian. Copies to be obtained through the national standards organizations.
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BRIEF HISTORY
740, Sodium carbonate for industrial use - Determination of
The IS0 Recommendation R
total soluble alkalinity - Volumetric method, was drawn up by Technical Committee ISO/TC 47,
Chemistry, the Secretariat of which is held by the Ente Nazionale Italian0 di Unificazione (UNI).
Work on this question by the Technical Committee began in 1951 and led, in 1956, to the
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adoption of a Draft IS0 Recommendation.
In June 1966, this Draft IS0 Recommendation (No. 1006) was circulated to all the IS0
Member Bodies for enquiry. It was approved, subject to a few modifications of an editorial nature,
by the following Member Bodies :
Argentina Italy Switzerland
Austria
Japan Turkey
Belgium
Korea, Rep. of U.A.R.
Brazil
Netherlands United Kingdom
Chile
New Zealand U.S.A.
Czechoslovakia Poland U.S.S.R.
France
Portugal Yugoslavia
Germany
Romania
Hungary
South Africa,
India Rep. of
Israel
Spain
No Member Body opposed the approval of the Draft.
The Draft IS0 Recommendation was then submitted by correspondence to the IS0 Council,
which decided, in May 1968, to accept it as an IS0 RECOMMENDATION.
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ISO/R 740-1968 (E)
IS0 Recommendation R 740 May 1968
SODIUM CARBONATE FOR INDUSTRIAL USE
DETERMINATION OF TOTAL SOLUBLE ALKALINITY
VOLUMETRIC METHOD
1. SCOPE
This IS0 Recommendation describes a volumetric method for the determination of total soluble
alkalinity of sodium carbonate for industrial use.
2. PRiNCIPLE
Solution of the test portion, filtration of the solution and titration of the total soluble alkalinity with
N hydrochloric acid, using methyl orange as indicator.
NOTE. - If required, this determination may also be carried out by means of back titration using N hydrochloric
acid standard volumetric solution and N or 0.1 N sodium hydroxide standard volumetric solution.
3. REAGENTS
Distilled water or water of equivalent pu
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