The lime-soda process is used for large-scale water-softening operations. CaO is added to __________.
A) oxidize Fe2+ to insoluble Fe2O3
B) cause precipitation of magnesium as Mg(OH) 2
C) remove most Al3+ as solid Al(OH) 3
D) cause precipitation of iron and magnesium as Fe2MgO4
E) reduce the pH to 3-4
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