Determine the amount of Carbon Dioxide

 EXPERIMENT NO. 01

OBJECT: To determine the amount of free Carbon Dioxide (CO2) present in the given water sample with the help of standard 0.01N Sodium Hydroxide (NaOH) solution and phenolphthalein as an indicator.

 

OBSERVATION TABLE:

Titration between given water sample and N/100 Sodium Hydroxide using phenolphthalein as an indicator.

            

S. No.

Volume of water sample

(X)

(mL)

Burette Reading

(mL)

Concordant reading (Y) (mL)

Initial

Final

1

20 ml

0.0

11.0 ml

11.0 ml

          

CALCULATION:

Volume of given water sample (X) = 20 mL

Volume of N/100 NaOH used in presence of phenolphthalein indicator = Y mL

As per the Law of Equivalence:

 

N1V1 of Water

= N2V2 of NaOH

N1 × 20

= 0.01 × Y

N1

= Y/2000

=11/2000

N1

= 0.0055

                                                                         

Amount of free CO2 = Normality (N1) x Eq. Wt. of CO2 x 1000

= Y/2000 × 44/2 × 1000 ppm

=121 ppm or mg/L

 

 

RESULT: The amount of free Carbon Dioxide (CO2) present in given water sample is 1210 ppm.

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