The concentrations of various cations in seawater, in moles per liter, are
(a) At what [OH– ] does Mg(OH)2 start to precipitate?
(b) At this concentration, will any of the other ions precipitate?
(c) If enough OH– is added to precipitate 50% of the Mg2+, what percentage of each of the other ions will precipitate?
(d) Under the conditions in (c), what mass of precipitate will be obtained from one liter of seawater?
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