The titration of 17.20 mL of HCl solution of unknown concentration requires 12.53 mL of a 0.170 M NaOH solution to reach the equivalence point. What is the concentration of the unknown HCl solution in M?

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.

about what?
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Answer ozone (o3) is made of three atoms of oxygen, it is a molecule;

Ithink carbon dioxide, i am not completely sure.tell me if i am wrong.