Determination of Dissolved Oxygen in Water Using the Winkler Method
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Expt. No:
3
Determination of Dissolved Oxygen present in a given Water Sample by Iodometric Method Method (Winkler’s Method) Method)
Aim
To determine the amount of dissolved oxygen (D.O.) in a given water sample by Iodometric Method (Winkler’s Method) Theory
Oxygen is poorly soluble in water. The solubility of oxygen of air in fresh water varies from 7.5 - 14.5 mg/Lit. Dissolved oxygen is needed for living organism to maintain their biological process. It is an important factor in corrosion. Iodometric method (Winkler’s method) is used for determining dissolved oxygen in water. The principle involved in the determination of dissolved oxygen is to bring about the oxidation of potassium iodide (KI) to iodine (I2) with the dissolved oxygen present in the water sample after adding MnSO4, KOH and KI, the basic manganic oxide formed act as an oxygen carrier to enable the dissolved oxygen in the molecular form to take part in the reaction.
+ ⟶ + Basic manganic manganic oxide which on acidification gives + ⟶ Basic + ⟶ + + + + ⟶ + + The liberated iodine (I2) is titrated against standard sodium thiosulphate (Na 2S2O3) solution using starch as indicator
, Potassium iodide solution, starch solution as indicator
Procedure:
Take 100 ml of given water sample into a conical flask, and titrate slowly against N / 50 50 standard sodium thiosulphate solution (taken in the burette). When the colour of the solution is very light yellowish add about 2 ml of freshly prepared starch solution, so the colour of the solution turned t urned into blue. Continue the titration till the disappearance of blue colour of the solution and note down the volume of the titrant used. The titration is repeated until a concordant volume is obtained.
Result: The amount of dissolved oxygen (D.O.) in a given water sample is……………..ppm �
Observations and Calculations:
S.No
Burette Readings in ml
Volume of given water sample in ml
Initial
Final
Volume of Na2S2O3 solution in ml
1 2 3 4 Concordant Volume of Na 2S2O3 solution, V 1 =………ml
Normality of standard Na 2S2O3 solution, N 1
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Volume of standard Na 2S2O3 solution, V 1
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Volume of given water sample, V 2
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Normality of given water sample, N 2 can be calculated from the normality formula, i.e., N1 x V1 = N2 x V2