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If total hardness and alkalinity of a water sample are 400mg/L as CaCO3 and 250 mg/L as CaCOrespectively, what are the values of carbonate hardness and non-carbonate hardness?
  • a)
    250 mg/L and zero
  • b)
    Zero and 50 mg/L
  • c)
    250 mg/L and 150 mg/L
  • d)
    50 mg/L and zero
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
If total hardness and alkalinity of a water sample are 400mg/L as CaCO...
Carbonate hardness is lesser of alkalinity and total hardness.
Hence carbonate hardness= 250 mg/l and Non-Carbonate Hardness= 400-250= 150 mg/l.
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Most Upvoted Answer
If total hardness and alkalinity of a water sample are 400mg/L as CaCO...
Carbonate hardness refers to the portion of total hardness that is due to the presence of bicarbonate and carbonate ions, while non-carbonate hardness refers to the portion of total hardness that is due to the presence of other ions such as sulfates and chlorides. To determine the values of carbonate hardness and non-carbonate hardness, we need to subtract the alkalinity value from the total hardness value.

Given:
Total hardness = 400 mg/L as CaCO3
Alkalinity = 250 mg/L as CaCO3

To calculate the carbonate hardness, we subtract the alkalinity from the total hardness:
Carbonate hardness = Total hardness - Alkalinity
= 400 mg/L as CaCO3 - 250 mg/L as CaCO3
= 150 mg/L as CaCO3

To calculate the non-carbonate hardness, we need to subtract the carbonate hardness from the total hardness:
Non-carbonate hardness = Total hardness - Carbonate hardness
= 400 mg/L as CaCO3 - 150 mg/L as CaCO3
= 250 mg/L as CaCO3

Therefore, the values of carbonate hardness and non-carbonate hardness are 150 mg/L and 250 mg/L as CaCO3, respectively.

So, the correct answer is option C) 250 mg/L and 150 mg/L.
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If total hardness and alkalinity of a water sample are 400mg/L as CaCO3and 250 mg/L as CaCO3respectively, what are the values of carbonate hardness and non-carbonate hardness?a)250 mg/L and zerob)Zero and 50 mg/Lc)250 mg/L and 150 mg/Ld)50 mg/L and zeroCorrect answer is option 'C'. Can you explain this answer?
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