What substance would you add to kf(aq) to form a buffer solution?

Yeah irbyoundo this you will get the a swer wuick

Both models are effective because they show the valence electrons, and these valence electrons indicate the reactivity of an element.

The answer is d.potassium

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.