Why might sodium carbonate (washing soda, Na2CO3) be added to hard water to aid in cleaning?
A) The hard ions in the water are more attracted to the carbonate ions -2 charge.
B) The hard ions are dissolved by the added sodium ions.
C) The soap gets softer due to the added ions.
D) The ions solubilize the soap due to ion-ion intermolecular attraction, which improves the cleaning ability.
E) none of the above
Answer: A
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