The chemical 5-amino-2,3-dihydro-1,4-phthalazinedione, better known as luminol,
ID: 787810 • Letter: T
Question
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.
A)
What is the molarity of the stock solution of luminol
B)
Before investigating the scene, the technician must dilute the luminol solution to a concentration of 6.00
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 20.0g of luminol into a total volume of 75.0 mL of H 2 O . What is the molarity of the stock solution of luminal Before investigating the scene, the technician must dilute the luminol solution to a concentration of 6.00 times 10?2M . 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? What volume of the stock solution (Part A) would contain the number of moles present in the diluted solutionExplanation / Answer
Mol luminol in 15g: = 15/177 = 0.0847mol
Molarity = mol of soluite / volume solution in litres
Molarity = 0.0847/0.075 = 1.1299
Molarity of stock solution = 1.13M
Part B:
1 litre of the dilutes solution contains 6.00*10^-2 mol luminol (given)
2 litres contains (6.00*10^-2)*2 = 1.20*10^-1 mol Luminol
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