Scribd
Upload
445 views2 pages

Determination of Dissolved Carbon Dioxide in A Given Water Sample

This document describes an experiment to determine the amount of dissolved carbon dioxide in a water sample. The experiment involves titrating a water sample with a sodium carbonate solution and noting the volume used at the endpoint to calculate the concentration of carbon dioxide using a provided formula.

Uploaded by

yousaf khan
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as DOCX, PDF, TXT or read online on Scribd
445 views2 pages

Determination of Dissolved Carbon Dioxide in A Given Water Sample

This document describes an experiment to determine the amount of dissolved carbon dioxide in a water sample. The experiment involves titrating a water sample with a sodium carbonate solution and noting the volume used at the endpoint to calculate the concentration of carbon dioxide using a provided formula.

Uploaded by

yousaf khan
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as DOCX, PDF, TXT or read online on Scribd
You are on page 1/ 2

Experiment No:7

Determination of Dissolved Carbon Dioxide


in a Given Water Sample.
Introduction:
Carbon dioxide is dissolved in water due to the ambient and
due to other biological processes going in water. Carbon
dioxide is responsible for the acidity too in water.
Apparatus:

 Burette
 Pipettes
 Measuring Cylinders
 Titration Flask
 Beaker
Reagents:

 Na2CO3 (Sodium Carbonate, 0.045 N), phenolphthalein


Procedure:

 Take 50 ml of water sample in titration flask.


 Add 4 drops of phenolphthalein indicator.
 If sample becomes pink then there is no free CO 2. Don’t
titrate it.
 If the sample is colorless, it means that free CO2 is
present.
 Titrate it with Na2CO3 (0.045 N).
 When the very light pink color appears, it means that it is
the end point. Note the ml of titrant used and calculate
free CO2 by the following formula:
mg ( ml of titrant ) ×(0.045)× 22× 1000
CO 2∈ =
lit sample volume ∈ml .

Observations and Calculations:

No.of Initial Final Actual Mean


Observations reading Reading Volume
(ml) (ml) (ml)

You might also like