Determine the mass of Na2CO3 and the volume of 0.500 M HCl solution required to make 1.5 L of a buffer solution at and at a total concentration of 0.350 M.

A) Mass of Na2CO3: 10.5 g, Volume of HCl: 0.75 L
B) Mass of Na2CO3: 5.0 g, Volume of HCl: 1.0 L
C) Mass of Na2CO3: 7.5 g, Volume of HCl: 1.25 L
D) Mass of Na2CO3: 12.0 g, Volume of HCl: 0.50 L