Chemistry
10th Edition
ISBN: 9781305957404
Author: Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher: Cengage Learning
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Copper is regulated in drinking water to protect public health. The relevant reaction is below. The solubility product (equilibrium constant) for the reaction is pK = 19.3.
Cu(OH)2 (s) = Cu+2 + 2 OH-
The regulatory “action limit” (concentration at which a drinking water utility must take action to reduce levels) is 1.3 mg/L dissolved copper.
- If the water is at a pH of 7.2, is the level of dissolved copper above, at, or below the action limit?
- To reduce the concentration of dissolved copper, would you raise or lower the pH? Why?
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