Hardness of water is 400 ppm

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Problem

Hardness of water is 400 ppm. The molarity of CaCO3\text{CaCO}_3 in this water is : (1) 4×10−6M4 \times 10^{-6} M (2) 4×10−2M4 \times 10^{-2} M (3) 4×10−3M4 \times 10^{-3} M (4) 4×10−1M4 \times 10^{-1} M

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