Accurately weigh about 0.5 g ( 0.1 mg) of the powdered sample and transfer to a clean 250-mL Erlenmeyer flask. Dissolve the sample in ~50 mL of deionized water. Your tablets may not dissolve completely in water; if they are not completely soluble, add 5 mL of 6 M HCl and carefully warm the mixture to assist in the solution process. Allow the mixture to cool back to room temperature before proceeding.