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Ion concentrations obtained for a groundwater sample (having pH = 8.1) are given below:
Carbonate hardness (mg/L as CaCO3) present in the above water sample is (Answer up to the nearest integer)
Correct answer is '205'. Can you explain this answer?
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Ion concentrations obtained for a groundwater sample (having pH = 8.1)...
Carbonate hardness is equal to the total hardness or alkalinity whichever is less.
Now, calculation of alkalinity which is caused by CO-3, HCO-3 and OH- and SO-4 and CI- does not cause any alkalinity but contributes to the total hardness.
Alkalinity = lon concentration of HCO-3 x 
[Note = There is no any ion concentration of CO-3 and OH-]
Alkalinity = 250 × 50/61 = 204.91 ≈ 205
pH of water is 8.1. So, H+ ion also contributes little amount of alkalinity.
So, total alkalinity = 205
Carbonate hardness = 205 mg/L
Most Upvoted Answer
Ion concentrations obtained for a groundwater sample (having pH = 8.1)...
Carbonate hardness is equal to the total hardness or alkalinity whichever is less.
Now, calculation of alkalinity which is caused by CO-3, HCO-3 and OH- and SO-4 and CI- does not cause any alkalinity but contributes to the total hardness.
Alkalinity = lon concentration of HCO-3 x
[Note = There is no any ion concentration of CO-3 and OH-]
Alkalinity = 250 × 50/61 = 204.91 ≈ 205
pH of water is 8.1. So, H+ ion also contributes little amount of alkalinity.
So, total alkalinity = 205
Carbonate hardness = 205 mg/L
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Ion concentrations obtained for a groundwater sample (having pH = 8.1) are given below:Carbonate hardness (mg/L as CaCO3) present in the above water sample is (Answer up to the nearest integer)Correct answer is '205'. Can you explain this answer?
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