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6 ml of a standard soap solution (1 ml = 0.001gm) of CaCO3 were required in titrating 50 ml of water to produce a good lather. Calculate its degree of Hardness?

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a

120 PPM

b

100 PPM

c

50 PPM

d

60 PPM

answer is A.

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Detailed Solution

Density of H2O1gm/ml 50gms of H2O - - - - - - - - 6×10−3gmCaCO3106gms of H2Ou___=6×10−3×10650=120gmsCaCO3∴120 PPM.

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6 ml of a standard soap solution (1 ml = 0.001gm) of CaCO3 were required in titrating 50 ml of water to produce a good lather. Calculate its degree of Hardness?