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

question 144

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.