Multiple choice

By what name is water which contains soluble salts of calcium and magnesium is known?

  1. soft water

  2. heavy water

  3. hard water

  4. mineral water
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Hard water contains dissolved calcium and magnesium ions (usually as sulfates, chlorides, or bicarbonates) that interfere with soap's cleaning action. Soft water has little or no dissolved calcium/magnesium. Heavy water contains deuterium oxide (D2O) and is used in nuclear reactors. Mineral water contains dissolved minerals but may or may not be 'hard'.

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