I keep getting 130gm for the answer!! Supposed to be 129.9 (I know it will round up, but rounded up is not the answer) I just need to know
A pharmacy has 325 mL of a 40% solution in stock. 120mL of sterile water is added to the solution to decrease the solution's concentration. How many grams of active ingredient would be in the diluted solution?
Actually, since they give you volumes, you have no idea how many grams are in solution!
A 40% solution of NaCl would have a lot less mass of solute than a 40% solution of Fe2O3!