An aqueous solution contains 0.31 M ammonium chloride. One Liter of this solution could be converted into a buffer by the addition of: (Assume that the volume remains constant as each substance is added.)

		0.075 mol Ba(OH)2
		0.30 mol CaCl2
		0.30 mol NH3
		0.15 mol HBr
		0.31 mol HBr