Hard Water Contains Mg²⁺ and Ca²⁺ Ions and Tends to Form

question 83

Multiple Choice

Hard water contains Mg²⁺ and Ca²⁺ ions and tends to form a ring in a bathtub due to its reaction with the soluble anions in soap. The formation of this insoluble material is an example of __________

• A) an acid-base reaction.
• B) a precipitation reaction.
• C) a redox reaction.
• D) a bathochromic shift.
• E) bad housekeeping.

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