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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.

Luminol has a molecular weight of 177 g/mol

The forensic technician at a crime scene has just prepared a luminol stock solution by adding 14.0g of luminol into a total volume of 75.0 mL of H2O.

What is the molarity of the stock solution of luminol? I got 1.05M

Before investigating the scene, the technician must dilute the luminol solution to a concentration of 3.00

Respuesta :

Answer: The molarity of stock solution of luminol is 1.055 M

Explanation:

To calculate the molarity of solution, we use the equation:

[tex]\text{Molarity of the solution}=\frac{\text{Mass of solute}\times 1000}{\text{Molar mass of solute}\times \text{Volume of solution (in mL)}}[/tex]

Given mass of luminol = 14.0 g

Molar mass of luminol = 177 g/mol

Volume of solution = 75.0 mL

Putting values in above equation, we get:

[tex]\text{Molarity of stock solution}=\frac{14\times 1000}{177\times 75.0}\\\\\text{Molarity of stock solution}=1.055M[/tex]

Hence, the molarity of stock solution of luminol is 1.055 M

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