Which pair of substances dissolved in 1.0L of water would give an effective buffer solution?

Please Explain





A) 1 mole HC2H3O2 and 0.50 HCl


B) 1 mole NaOH and 0.50 mole HCl


C) 1 mole HC2H302 AND 0.50 mole NaOH


D) 0.50 mole HC2H3O2 and 0.5 mole NaOH

Which pair of substances dissolved in 1.0L of water would give an effective buffer solution?
C) This mixture would result in an equimolar solution of acetic acid and sodium acetate (0.5 M for both). This is the optimum buffering situation for an acetate buffer solution.