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.