Dissolved CO2 in water

Karuna's Avatar


24 Jul, 2015 12:40 AM

In the article on this site, Water Analysis: Dissolved Carbon Dioxide (CO2), what concentration of sodium hydroxide solution should be used?

The method I am using is
Fill the mixing bottle to the 23- ml mark with the water sample
Add one drop of the phenophthalein indicator solution to the sample.
Add the sodium hydroxide solution drop by drop to the sample. Count each drop as it is added. Swirl the bottle to mix after each drop is added. Continue adding drops until a light pink color forms, and persists for 30 seconds.
Each drop of sodium hydroxide solution used equals 1.25 mg/l carbon dioxide.


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