You have a 10.0 mL sample of HCl to be titrated with 0.100 M NaOH. The initial reading of the volume in the buret was 2.10 mL. The reading of buret at the end point of the titration was 39.50 mL. What is the concentration of the HCl

Cause its being chemically applied?

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.