Hard Water, Which Contains Mg²⁺ and Ca ²⁺ Ions, Tends

question 129

Multiple Choice

Hard water, which contains Mg²⁺ and Ca ²⁺ ions, 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 combustion reaction.
• E)a decomposition reaction.

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