The forensic technician at a crime scene has just prepared a luminol stock solut

Question

The forensic technician at a crime scene has just prepared a luminol stock solution by adding 12.0 g of luminol into a total volume of 75.0 mL of H_2O. What is the molarity of the stock solution of luminol? Express your answer with the appropriate units. Before investigating the scene, the technician must dilute the luminol solution to a concentration of 6 00 times 10^-2 M. The diluted solution is then placed in a spray bottle for application one the desired surfaces. How many moles of luminol are present in 2.0 L of the diluted spray? Express your answer with the appropriate units.

Explanation / Answer

(A)

MW of luminol = 177 g

Moles of luminol taken = Mass taken / MW = 12/177 = 0.067

Volume of solution = 75mL = 0.075 L

Molarity of solution = moles/Volume = 0.067/0.075 = 0.893 M

(B)

Moles of luminol present in diluted solution = Molarity * Volume in liters = 0.06*2 = 0.12 moles

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