8.1, (4 points) Describe the preparation of two standard solutions that have 450 ppm of Na+ in 250 mL volumetric flask and another one with 300 ppm of K+ in 100 mL volumetric flask from primary standard of sodium chloride and potassium chloride respectively. (MM of Na = 23 g/mol, MM of K = 39.1 g/mol, MM of Cl = 35.45g/mol).

Please show all your calculation to get full credits.

8.2, (2 points) Use the above standard solutions to prepare 100 mL of one standard solution that contains 45.0 ppm Na+ and 35.0 ppm K+ in the same volumetric flask.