Module 4: Liquid Characteristics - pH - Practice Problems

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Instructions:: Work these problems on a sheet of paper and check your answers against those provided below.

#1: An aqueous solution has a [H⁺] concentration of 1 mole/L. What is the [OH^-] concentration?

: Answer: 1 10^-14 moles/L; Solution:

#2: What is the normal pH range for aqueous liquids involved in air pollution control?

: Answer: 5 to 9; The normal pH range for air pollution control is from 5 to 9.

#3: Sulfur dioxide emissions at a plant are controlled by a limestone wet scrubber. The pH of the aqueous liquid exiting the scrubber is 4.5. What is the [H⁺] and [OH^-] of the aqueous liquid exiting the scrubber? Should the company be concerned with a liquid having this pH level? If so, what effect could the exiting solution have on the scrubber system?

Answer:

[H⁺] = 1

10^-4.5 moles/L

[OH⁺] = 3.2

10^-10 moles/L

Corrosion in the piping, nozzles, and other material in contact with the scrubber liquid may occur due to the acidic nature of the aqueous solution exiting the wet scrubber.

Solution:

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Module 4: Liquid Characteristics - pH - Practice Problems

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