Chemistry Practice Problems ppm Practice Problems Solution: The units of parts per million (ppm) and parts per...

🤓 Based on our data, we think this question is relevant for Professor Egolf's class at Penn State University Park.

Solution: The units of parts per million (ppm) and parts per billion (ppb) are commonly used by environmental chemists. In general, 1 ppm means 1 part of solute for every 106 parts of solution. Mathematically, by mass: ppm = μg solute / g solution = mg solute / kg solutionIn the case of very dilute aqueous solutions, a concentration of 1.0 ppm is equal to 1.0 μg of solute per 1.0 mL, which equals 1.0 g solution. Parts per billion is defined in a similar fashion. Calculate the molarity of each of the following aqueoussolutions.d. 0.10 ppm DDT (C14H9Cl5) in H2O

Problem

The units of parts per million (ppm) and parts per billion (ppb) are commonly used by environmental chemists. In general, 1 ppm means 1 part of solute for every 106 parts of solution. Mathematically, by mass: 

ppm = μg solute / g solution = mg solute / kg solution

In the case of very dilute aqueous solutions, a concentration of 1.0 ppm is equal to 1.0 μg of solute per 1.0 mL, which equals 1.0 g solution. Parts per billion is defined in a similar fashion. Calculate the molarity of each of the following aqueous
solutions.

d. 0.10 ppm DDT (C14H9Cl5) in H2O

Solution

We’re being asked to determine the molarity of DDT (C14H9Cl5) in 0.10 ppm DDT in water. Let’s first define ppm and ppb.


1 ppm means 1 part of solute for every 106 parts of the solution

in terms of solutions:

ppm=μg solutemL solution


1 ppb means 1 part of solute for every 109 parts of the solution

Solution BlurView Complete Written Solution