Which of the following statements is true about the composition of Calcium Carbonate (CaCo3) in soft water?(a) 0 to 30 milligrams of CaCO3 per litre(b) 30 to 60 milligrams of CaCO3 per litre(c) 60 to 90 milligrams of CaCO3 per litre(d) 90 to 120 milligrams of CaCO3 per litre

(b) 30 to 60 milligrams of CaCO₃ per litreWater hardness is classified based on the concentration of dissolved minerals, primarily calcium carbonate (CaCO₃). While there are several scales, a common classification is:Soft Water: 0–60 mg/L of CaCO₃Moderately Hard Water: 61–120 mg/L of CaCO₃1Hard Water: 121–180 mg/L of CaCO₃Very Hard Water: > 180 mg/L of CaCO₃2Based on this classification, the range of 30 to 60 milligrams of CaCO₃ per litre falls squarely within the definition of soft water.3 The range in option (a) also describes soft water, but option (b) represents the higher end of the soft water spectrum. Given the options, 30 to 60 mg/L is a correct classification for water that is considered soft to slightly moderately hard.

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Which of the following statements is true about the composition of Calcium Carbonate (CaCo₃) in soft water?
(a) 0 to 30 milligrams of CaCO₃ per litre
(b) 30 to 60 milligrams of CaCO₃ per litre
(c) 60 to 90 milligrams of CaCO₃ per litre
(d) 90 to 120 milligrams of CaCO₃ per litre

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Detailed Solution

(b) 30 to 60 milligrams of CaCO₃ per litre

Water hardness is classified based on the concentration of dissolved minerals, primarily calcium carbonate (CaCO₃). While there are several scales, a common classification is:

Soft Water: 0–60 mg/L of CaCO₃
Moderately Hard Water: 61–120 mg/L of CaCO₃¹
Hard Water: 121–180 mg/L of CaCO₃
Very Hard Water: > 180 mg/L of CaCO₃²

Based on this classification, the range of 30 to 60 milligrams of CaCO₃ per litre falls squarely within the definition of soft water.³ The range in option (a) also describes soft water, but option (b) represents the higher end of the soft water spectrum. Given the options, 30 to 60 mg/L is a correct classification for water that is considered soft to slightly moderately hard.

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