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

question 42

Multiple Choice

The lime- soda process is used for large- scale water- softening operations. CaO is added to
)

• A) cause precipitation of iron and magnesium as Fe₂MgO₄
• B) reduce the pH to 3- 4
• C) cause precipitation of magnesium as Mg(OH)₂
• D) oxidize Fe²⁺ to insoluble Fe₂O₃
• E) remove most Al³⁺ as solid Al(OH)₃