Multiple choice

Hard water contains salts of

  1. H

  2. S

  3. Ca

  4. Na

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Hard water contains dissolved salts of calcium (Ca) and magnesium. When water percolates through limestone, chalk, or gypsum deposits, it dissolves calcium and magnesium ions. Hard water is characterized by high mineral content, primarily calcium and magnesium ions.