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
Question 2
A 0.100 M solution of ________ will contain the highest concentration of potassium ions.
A) potassium phosphate
B) potassium hydrogen carbonate
C) potassium hypochlorite
D) potassium iodide
E) potassium oxide
