To Choose:The correct option
Explanation of Solution
Introduction:
Water that contains high quantity of metallic minerals and does not form lather readily with soap is called hard water.
Hard water contains mineral ions such as magnesium, iron and calcium that replaces the sodium and potassium ions of the soap, due to which insoluble salts are formed that precipitate out of solution as soap scum.
Thus, hard water does not contain sodium ions.
Conclusion:
Hence, option D-sodium ionsdoes not contribute to hard water.
Chapter 22 Solutions
Glencoe Physical Science 2012 Student Edition (Glencoe Science) (McGraw-Hill Education)
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