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 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

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FREE Expert Solution
FREE Expert 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

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Problem Details

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

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

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Our data indicates that this problem or a close variation was asked in Chemistry - Zumdahl 7th Edition. You can also practice Chemistry - Zumdahl 7th Edition practice problems.