The forensic technician at a crime scene has just prepared a luminol stock solution by adding 14.0 g of luminol into a total volume of 75.0 mL of H20.
What is the molarity of the stock solution of luminol?
Luminol has a molecular weight of 177g/mol
To calculate the molarity of the stock solution of luminol, we first need to determine the number of moles of luminol present in the solution.
1. Calculate the number of moles of luminol:
Moles = Mass / Molecular Weight
Moles = 14.0 g / 177 g/mol
Moles = 0.079 moles
2. Calculate the volume of the stock solution in liters:
Volume = 75.0 mL / 1000 mL/L
Volume = 0.075 L
3. Calculate the molarity of the stock solution:
Molarity = Moles / Volume
Molarity = 0.079 moles / 0.075 L
Molarity = 1.05 M
Therefore, the molarity of the stock solution of luminol is 1.05 M.