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Class 11 Chemistry Notes Stocihiometry – Calculation of Chlorine from a Sample of Bleaching Powder

by Anand Meena
April 22, 2019
in 11th Class, Class Notes
Reading Time: 2min read
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The weight % of available Cl2 from the given sample of bleaching powder on reaction with dil acids or CO2 is called available chlorine.

CaOCl2 + H2SO4 → CaSO4 + H2O + Cl2
CaOCl2 + 2HCl → CaCl2 + H2O + Cl2
CaOCl2 + 2CH3COOH → Ca (CH3COO) 2 + H2O + Cl2
CaCOl2 + CO2 → CaCO3 + Cl2

Method of determination:

Bleaching powder + CH3COOH + KI (starch/Hypo)end point
Meq. Of I2 = Meq. Of Cl2 = Meq. Of Hypo solution
% of Cl2 = (3.55 × x × V (mL)/W (g))
Where x=Molarity of hypo solution
V =mL of hypo solution used in titration.

Ex.1.   10 gm sample of bleaching powder was dissolved into water to make the solution on liter. To this solution 35 mL of 1.0 M Mohr salt solution was added containing enough H2SO4. After the reaction was complete, the excess Mohr salt required 30 mL of 0.1 M KMnO4 for oxidation. The % of available Cl2 approximately is (mol wt=71)

Sol.2.  Meq. Of Mohr’s salt =35×1×1=35
Meq. Of KMnO4=Meq. Of excess Mohr salt=30×0.1×5=15
Meq. Of Mohr salt reacted with bleaching powder =35-15=20
Meq. Of Cl2=20
Wt. of Cl2 = 20 × 10-3 × (71/2) = 0.71 gm
% of Cl2 = (0.71/10) × 100 = 7.1% Ans.

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Tags: CBSE 11 NotesCBSE Class XI Chemistry NotesCBSE NotesClass 11 NotesClass 11thClass 11th NotesClass XI Chemistry NotesClass XI Stocihiometry NotesFree NotesNCERT Class NotesStocihiometry Notes

Anand Meena

Full time entrepreneur, likes to indulge in writing reviews about the latest technologies apart from helping students in career and exam related topics.

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