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Q.

12 ml of saturated soap solution [1ml=0.001g of CaCO3] were required in the titration of 100 ml of
water to produce a good lather. Its degree of hardness is

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a

100 ppm

b

120 ppm

c

60 ppm

d

80 ppm

answer is B.

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Detailed Solution

In 1 ml 0.001 g of CaCO3 is present
12ml = 12 x 0.001g = 0.012g
hardness = 0.0121/100 x 106 = 120

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12 ml of saturated soap solution [1ml=0.001g of CaCO3] were required in the titration of 100 ml ofwater to produce a good lather. Its degree of hardness is