Adrinking water at ph 7.2 contains 8 x 10^-4 m tot ca and has an alkalinity of 80 mg/l as caco3, provided entirely by species of the carbonate group. it is desired to adjust the ph of this water to cause calcite to be slightly supersaturated for the purposes of corrosion control. how much lime must be added to achieve a saturation index of 0.2? what would the ph of the water be?

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You would be correct, boiling water does disinfect contamination.    the property of disinfecting means to kill  germs, bacteria and other pathogens or contamination  that might cause an infection or cause a person to become sickly. a couple methods of disinfecting are using soap, other cleaning supplies or by simply "boiling" the contaminate.  the reason why boiling water disinfects certain attributes is because some cells cannot survive the heat and pressure.