Couple chem. questions please help.

Question

Of the following solutions, which has the greatest buffering capacity?

A)0.365M HC2H3O2 and 0.497 M NaC2H3O2

B)0.121 M HC2H3O2 and 0.116 M NaC2H3O2

C) 0.821 M HC2H3O2 and 0.713 M NaC2H3O2

D) 0.521 M HC2H3O2 and 0.217 M NaC2H3O2

Also

Of the following, only ______ is not a state function.

A) T

B) H

C) E

D) S

E) q

please explain the answer if possible .. thank you

Answer 1

C) has the greatest buffering capacity, because it has highest molarity of acid and conjugate base. Therefore, it can take the greatest concentration of added H+ or OH- before running out of capacity.

E) q is not a state function. This is explained at the beginning of thermodynamics, when you learn E = q - w.