Chem. 101 Lab Problems Molarity and Dilution 7. How many grams are needed to make 4.5L of 1.5M HCI solution? 8. How many grams are needed to make 670mL of 0.53 M NaOH solution? 9. In an experiment a standard is made with 10.0 mL of the 0.4M stock solution and diluted to 35 mL. What is the concentration of this Standard? 10. What is the concentration of a standard solution made with 60.0 mL stock solution with a oncentration of 0.5M and diluted to 150 mL?