3.55g of bleaching powder when treated with acetic acid and excess of KI liberated iodine which required 60 ml of 0.5 N sodium thiosulphate solution the percent of available chlorine is
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Explanation:
AS VALENCY FACTOR OF IODINE IS SAME IN TWO REACTIONS THAT ARE REACTION WITH BLEACHING POWDER AND REACTION WITH NA2S2O3
EQUIVALENT OF I2 = 30
EQUIVALENT OF I2 = EQUIVALENT OF BLEACHING POWDER
30=MOLES*F*1000
0.03=MOLES*F
0.03= MOLES*2
0.015 = MOLES
MASS/MOLAR MASS = 0.015
MASS = 127*0.015
MASS = 1.095 g
difference of mass gives reacted bleaching
mass = 1.645
equivalent of caocl2 reacted = 25.90
equivalent of chlorine = 25.90
w/71*2*1000 = 25.90
w=0.91
percentage = 0.91/3.55*100
=26
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