The forensic technician at a crime scene has just prepared a luminol stock solution by adding 17.0 of luminol into a total volume of 75.0 of .
What is the molarity of the stock solution of luminol?
Molarity= moles of solute/liters of solution.
in a total of 75.0 WHAT?
molarity = moles/L. To find moles remember that moles = grams/molar mass.
0.00720339 mol
To find the molarity of the luminol stock solution, you need to use the formula:
Molarity (M) = moles of solute / volume of solvent (in liters)
First, we need to find the moles of luminol. To do this, we can use the formula:
moles = mass / molar mass
The molar mass of luminol (C8H7N3O2) is 177.22 g/mol.
Given that 17.0 g of luminol is dissolved in a total volume of 75.0 mL (which is equivalent to 0.075 L) of water, we can plug these values into the moles formula:
moles = 17.0 g / 177.22 g/mol
moles = 0.096 mol
Now, we can calculate the molarity using the moles of the solute and the volume of the solvent:
Molarity = 0.096 mol / 0.075 L
Molarity = 1.28 M (rounded to two decimal places)
Therefore, the molarity of the luminol stock solution is 1.28 M.