Answer each of the following briefly: (a) Why is cake alum [Al2(SO4)3] added during
Chapter 13, Problem 13.128(choose chapter or problem)
Answer each of the following briefly: (a) Why is cake alum [Al2(SO4)3] added during water purification? (b) Why is water that contains large amounts of Ca2_ and Mg2_ difficult to use for cleaning? (c) What is the meaning of reverse in reverse osmosis? (d) Why might a water treatment plant use ozone as a disinfectant instead of chlorine? (e) How does passing a saturated NaCl solution through a spent ion-exchange resin regenerate the resin?
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