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 :

Options

A. there are no `Ca^(2+)` or `Mg^(2+)` ion in the water
B. there are no `CO_3^(2-)` or `HCO_3^- ` ion in the water
C. concentration of any ion in the water is lower than 0.038 M
D. water may be containing `Na^+` ions in concentration gt 0.04 M

Answer

b