Dissolved Carbon Dioxide in Water
Amal Almuhanna
2012
1- Equivalent weight
: The equivalent weight of a
compound can be calculated by dividing the
molecular weight by the number of positive or
negative electrical charges that result from the
dissolution of the compound(acidity or basicity).
ex: NaOH
23+16+2
=
molecular weight
= 41
basicity
1
2- Molarity:
is the number of moles of solute
dissolved in one liter of solution.
The units, therefore are
moles per liter
,
specifically it's
moles of solute
per
liter of
solution.
3-Normality:
The normality of a solution is the
gram equivalent weight of a solute per liter of
solution.
Normality is the only concentration unit that is
reaction dependent.
Free Carbon dioxide dissolved in water
Principle:-
It is the normal practice to distinguish free
carbondioxide as the concentration of CO
2
+
H
2
CO
3
, which is estimated by titrating the sample
with standard alkali titrant to pH 8.3
Requirement
1)
Sodium Hydroxide
(0.02272 N)
2)
Phenolphthalein indicator
3)
Titration assembly
(burette, pipette, Conical
flasks, measuring cylinder,
stand, clamps etc.)
Method
1)
Take 50 ml of water sample in a flask.
2)
Add 2 drops of phenolphthalein indicator
If slight pink colour develops then free
carbondioxide is absent).
If the solution remains colourless, titrate with
standard alkali titrant to slight pink end point.
3) Note the reading and calculate the free
carbondioxide in milligram per liter.
Observations
Calculations
Free CO
2
(mg/l) =
Volume of titrantX1000
Volume of sample
Results: Expressed as mg/l
Exploring the concept of free carbon dioxide dissolved in water, this content provides scientific terms related to underwater fish and the principles of distinguishing CO2 concentration, along with a detailed method for measuring free carbon dioxide levels. The process involves using sodium hydroxide, phenolphthalein indicator, and titration assembly to calculate the concentration of CO2. With step-by-step instructions and observations, this resource offers insights into assessing free CO2 levels in water samples.
Uploaded on Feb 24, 2025 | 0 Views
Download Presentation
Please find below an Image/Link to download the presentation.
The content on the website is provided AS IS for your information and personal use only. It may not be sold, licensed, or shared on other websites without obtaining consent from the author.If you encounter any issues during the download, it is possible that the publisher has removed the file from their server.
You are allowed to download the files provided on this website for personal or commercial use, subject to the condition that they are used lawfully. All files are the property of their respective owners.
The content on the website is provided AS IS for your information and personal use only. It may not be sold, licensed, or shared on other websites without obtaining consent from the author.
E N D
Presentation Transcript
Free Carbon dioxide dissolved in water Free Carbon dioxide dissolved in water Amal Almuhanna 2012
UnderWater Fish Some scientific terms 1- Equivalent weight: The equivalent weight of a compound can be calculated by dividing the molecular weight by the number of positive or negative electrical charges that result from the dissolution of the compound(acidity or basicity). ex: NaOH 23+16+2= molecular weight = 41 basicity 1
UnderWater Fish Some scientific terms 2- Molarity: is the number of moles of solute dissolved in one liter of solution. The units, therefore are moles per liter specifically it's moles of solute solution. moles per liter, moles of solute per liter of liter of solution.
UnderWater Fish Some scientific terms 3-Normality: The normality of a solution is the gram equivalent weight of a solute per liter of solution. Normality is the only concentration unit that is reaction dependent.
UnderWater Fish Free Carbon dioxide dissolved in water Free Carbon dioxide dissolved in water Principle: It is the normal practice to distinguish free carbondioxide as the concentration of CO2 + H2CO3, which is estimated by titrating the sample with standard alkali titrant to pH 8.3 Principle:- -
UnderWater Fish Requirement Requirement 1) Sodium Hydroxide (0.02272 N) 2) Phenolphthalein indicator 3) Titration assembly (burette, pipette, Conical flasks, measuring cylinder, stand, clamps etc.)
UnderWater Fish Method 1) Take 50 ml of water sample in a flask. 2) Add 2 drops of phenolphthalein indicator If slight pink colour develops then free carbondioxide is absent). If the solution remains colourless, titrate with standard alkali titrant to slight pink end point. 3) Note the reading and calculate the free carbondioxide in milligram per liter. Method
UnderWater Fish Observations Calculations Free CO2 (mg/l) = Volume of titrantX1000 Volume of sample Results: Expressed as mg/l
