A water sample from a municipal water supply was found to have a pH = 7.0. On evaporating 2 L 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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Total Mass: The total mass of all dissolved solids is 
.
Molarity Limit: Even using a light salt like 
, the maximum possible molarity is only 
.
Conclusion: No individual ion can exceed this mass, meaning all ion concentrations must be strictly lower than 0.038 M .
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