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The Lime-Soda Process Is Used for Large-Scale Water-Softening Operations

Question 30

Multiple Choice

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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