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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