Quick Answer:The Iodine Flask is a conical glass flask with a funnel-shaped neck and ground-glass stopper that holds a water seal, made in 100, 250 and 500 ml for iodine value determination and other redox titrations.
Last updated: 18 October 2026
Key Features
Erlenmeyer-style body with an oversized funnel-top neck.
Interchangeable ground-glass stopper.
Collar holds a water seal so iodine vapour does not escape.
Capacities of 100, 250 and 500 ml.
Permanent white enamel volume graduations.
Technical Specifications
Specification
Value
Material
Borosilicate glass 3.3
Capacities
100, 250, 500 ml
Stopper
Interchangeable ground glass
Seal
Collar for a water seal
Graduations
White enamel
How It Is Used
During an iodine value determination, water is held in the funnel collar round the stopper. Reagents such as potassium iodide can then be added through this seal, so volatile iodine stays in the flask throughout the reaction period. It is used in food science, petrochemical and analytical chemistry labs.
Frequently Asked Questions
Why does the Iodine Flask have a funnel-shaped neck?
The funnel collar holds a water seal round the stopper, so reagents can be added without letting iodine vapour escape.
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