Learn the toughest concepts covered in your GOB - General, Organic, and Biological Chemistry class with step-by-step video tutorials and practice problems.

Solutions

**Parts per Million (ppm)** and **Parts per Billion (ppb)** are used to express extremely dilute solution concentrations.

1

Parts per Million (ppm) Concept 1

1m

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2

Parts per Million (ppm) Example 1

1m

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3

Parts per Million (ppm) Concept 2

57s

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4

Parts per Million (ppm) Example 2

1m

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5

Problem

A 5.12 L sample of solution contains 0.230 g of potassium sulfate, K_{2}SO_{4}. Determine the concentration of K_{2}SO_{4} in ppm if the density of the solution is 1.30 g/mL.

A

34.6 ppm

B

28.9 ppm

C

22.3 ppm

D

43.6 ppm

6

Problem

Calculate the concentration in parts per billion of the following aqueous solution:0.91 mg of caffeine in a total volume of 131 mL.

A

0.14 ppb

B

0.0069 ppb

C

140 ppb

D

6900 ppb

7

Problem

Glucose makes up about 0.102% by mass of human blood. Calculate this concentration in ppm.

A

102 ppm

B

0.102 ppm

C

0.00102 ppm

D

1020 ppm

8

Problem

The average human body contains about 5,000 grams of blood. What mass of arsenic is present in the body if the amount in blood is 0.86 ppb?

A

5.8 x 10^{12} g

B

4.3 x 10^{12} g

C

4.3 x 10^{-6} g

D

5.8 x 10^{-6} g

9

Problem

A water sample contains the pollutant chlorobenzene with a concentration of 16 ppm (by volume). What volume of this water contains 5.01×10^{2} mL of chlorobenzene?

A

3.1 x 10^{7} mL

B

3.2 x 10^{4} mL

C

1.6 x 10^{6} mL

D

8.0 x 10^{10} mL