The [H3O+] of a 0.49 M solution of NH4Cl in H2O at 25°C is (Kb for NH3 = 1.8 × 10–5):

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.

The size is 8inches if ur a girl

Sorry i dont understand the question can you rephase it?

True or false:   the purpose of a defense mechanism is to get uncomfortable feelings out into the open so they can be dealt with in a healthy manner.indeed true: )