What volume of 8.4 N Al(OH)3 will be used to prepare 350 mL of 2.1 M solution?
How many mL of water will be used to prepare this dilute solution?

1. CU(NO3)2.3H20 (FW 241.58) will be used to prepare your copper stock solution. How much will you need to make up 250 ml of stock solution containing 250 μg/ml (= 250 ppm) as copper (250ppm Cu)? 2. Your stock solution will be diluted to prepare standard solutions for calibration of the photometer. Calculate the volumes of 250 μg/ml stock solution required to prepare 50 ml each of solutions with concentrations of 5, 10, 15, 20 and 25 μg/ml

A dilute solution is prepared by transferring 45.00 mL of a 0.5616 M stock solution to a 0.4000 L volumetric flask and diluting to mark. What is the molarity of this dilute .solution?