Earth’s Water (Section)
A first-stage recovery of magnesium from seawater is precipitation of Mg(OH)2 with CaO:
Mg2+(aq) + CaO(s) + H2O(l)→Mg(OH)2(s) + Ca2+(aq)
What mass of CaO, in grams, is needed to precipitate 1000 lb of Mg(OH)2?
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