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A water sample from a municipal water s...

A water sample from a municipal water supply was found to have a pH =7.0 On evaporting 2L of this water, 2.016 g of white solid was left behind in the evaporation vessel, i.e,. The Total Dissolved Solid (TDS) content of this water was 1008 mg `L^(-1)` However, addition of soap to a bucket of this water did not produce any visible scum.Based on these findings, one can conclude that :

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