2. What volume of a 0.500 M HCl solution is needed to neutralize each of the following: a) 20.0 mL of a 0.300 M NaOH solution. b) 20.0 ml of a 0.200 M Ba(OH)2 solution. 3. Dry ice is solid carbon dioxide. A 0.030 g sample of dry ice is placed in an evacuated 4.6 L vessel at 30 C. Calculate the pressure inside the vessel after all the dry ice has been converted to CO2 gas. 4. a) A typical commercial grade phosphoric acid stock is 75% H3PO4 by mass and has a density of 1.57 g/mL. Calculate the molarity of H3PO4 in this solution