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Grade: 11
        To a 25 mL H2O2 solution, excess of acidified solution of potassium iodide was added. The iodine liberated required 20 mL of 0.3 N sodium thiosulphate solution. Calculate the volume strength of H2O2 solution.
5 years ago

Answers : (2)

Kevin Nash
askIITians Faculty
332 Points
							Sol. Meq of H2O2 = Meq of Na2S2O3
If N is normality of H2O2, then 
N × 25 = 0.3 × 20
⇒ N = 0.24
⇒ Volume strength = N × 5.6 = 1.334 V

						
5 years ago
Anshika
11 Points
							M of H2O2 = M of Na2S2O3.If N = normality of H2O2; Then, N× 25 = 0.3 × 20N=0.24Now , volume strength=N × 5.6=0.24× 5.6 =》 1.344g/L
						
one year ago
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