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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