1. For each buffer, determine the volume of HCl and NaOH needed to change the pH by 1 unit. You may need to estimate this value if it is not directly observed in your data. Using your volumes, calculate the number of moles of HCl and NaOH that reacted with each buffer. (This is the capacity of each buffer.)

metals are good conductor of electricity. it has free electrons on their surface. according to electron pool theory, each atom present in a metal crystal losses all of its valence electron and as a result a pool of free is form. these pool of electrons are free to move and   conduct electricity easily   while making metal as good conductor.

the correct answer is a. the ability of electrons to flow throughout the metal.

if it's not useful, feel free to report for mistake in answer.