a reference solution is to be prepared with 5PPM parabenzopyrene(252 mol. wt.)the quantity of parabenzopyrene required for preparing one litre 5PPM solution is
To calculate the quantity of parabenzopyrene required to prepare a 5PPM (parts per million) solution, you need to know the molecular weight of parabenzopyrene and the volume of the solution you want to prepare.
First, let's understand what 5PPM means. PPM is a concentration unit that represents the number of parts of the solute (in this case, parabenzopyrene) per 1 million parts of the solution. So, in a 5PPM solution, there are 5 parts of parabenzopyrene for every 1 million parts of the solution.
Now, let's calculate the quantity of parabenzopyrene required.
Step 1: Convert the given PPM concentration to a decimal fraction.
- 5PPM means 5 parts per million, so it's 5/1,000,000 or 5e-6.
Step 2: Determine the molecular weight of parabenzopyrene.
- The molecular weight of parabenzopyrene is given as 252 mol. wt.
Step 3: Calculate the quantity of parabenzopyrene required using the formula:
- Quantity (in grams) = PPM concentration * Molecular weight * Volume (in liters)
Q = (5e-6) * (252) * (1)
Putting the values into the formula, we get:
Q = 5e-6 * 252 * 1
Q = 1.26 mg
Therefore, to prepare a 5PPM solution of parabenzopyrene with a volume of one liter, you would require 1.26 milligrams (mg) of parabenzopyrene.