Part A Constants Periodic Table The chemical 5-amino-2,3-dihydro-1,4- phthalazin

Question

Part A Constants Periodic Table The chemical 5-amino-2,3-dihydro-1,4- phthalazinedione, better known as luminol, is used by forensic scientists in analyzing crime scenes for the presence of washed-away blood. Luminol is so sensitive that it can detect blood that has been diluted 10,000 times. A basic solution of luminol is often sprayed onto surfaces that are suspected of containing minute amounts of blood The forensic technician at a crime scene has just prepared a luminol stock solution by adding 19.0 g of luminol into a total volume of 75.0 mL of H2O What is the molarity of the stock solution of luminol? Express your answer with the appropriate units View Available Hint(s) Luminol has a molecular weight of 177 g/mol molarity of luminol solution = Value Units Submit Part B Before investigating the scene, the technician must dilute the luminol solution to a concentration of 6.00x102 M. The diluted solution is then placed in a spray bottle for application on the desired surfaces How many moles of luminol are present in 2.00 L of the diluted spray? Express your answer with the appropriate units View Available Hint(s) moles of luminol = Value Units Submit

Explanation / Answer

A. Molarity = Mass of solute x1000 / Molar mass of solute x volume of solvent

Molarity = 19x1000/177x 75 = 1.43 M

B. No of Moles = Molarity /Volume in lit.

Moles = 6x 10*-2/2 = 3x10-2 moles

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