What volume of diluent must I add to 1 mL of a 4 mg/L solution of dexamethasone to get a concentration of 2.5 mg/L? Bonus: What volume of the diluted solution contains 0.35 mg of dexamethasone?
You will need 0.6 mL of diluent.
You can use the formula
You started with 1 mL and want 1.6 mL of diluted solution, so you must add
(1.6 -1) mL = 0.6 mL of diluent.
0.35 mg ×
So 0.14 mL of the diluted solution will contain 0.35 mg of dexamethasone.