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The T-alkalinity in water is 400mg/l as CaCO3 and P-alkalinity is 250mg/l as CaCO3. What will be the concentrations of OH-, CO3-2, HCO3- in mg/l respectively?
- a)0,100,300
- b)100,0,300
- c)100,300,0
- d)300,100,0
Correct answer is option 'C'. Can you explain this answer?
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Verified Answer
The T-alkalinity in water is 400mg/l as CaCO3 and P-alkalinity is 250m...
As P > 0.5T; then we have
OH- conc = 2P-T
= 2 × 250-400 = 100mg/l
CO3-2 conc = 2T-2P
= 2×400 -2×250 = 300mg/l
HCO3- conc = 0 mg/l
Note: T alkalinity is the measurement of all species of alkalinity in the water. It is the final endpoint for the alkalinity titration.
P alkalinity or Phenolphthalein alkalinity is the measurement of amount of carbonate and hydroxide using titration water samples with acid of a known concentration and using phenolphthalein indicator. It is measured down to a pH of 8.3.
Most Upvoted Answer
The T-alkalinity in water is 400mg/l as CaCO3 and P-alkalinity is 250m...
Given, T-alkalinity = 400 mg/l as CaCO3 and P-alkalinity = 250 mg/l as CaCO3.
We know that T-alkalinity includes the concentration of OH-, CO3-2, and HCO3-. Therefore, we can calculate the concentration of each as follows:
Total Alkalinity (TA) = T-alkalinity + P-alkalinity
TA = 400 + 250 = 650 mg/l as CaCO3
Concentration of HCO3- = TA - (CO3-2 + OH-)
Hence, HCO3- = 650 - (300 + 0) = 350 mg/l as CaCO3
Concentration of CO3-2 = P-alkalinity
Hence, CO3-2 = 250 mg/l as CaCO3
Concentration of OH- = 0 (as there is no excess of OH- present in the water sample)
Therefore, the concentrations of OH-, CO3-2, and HCO3- in mg/l respectively are 0, 300, and 350. Hence, the correct answer is option C.
We know that T-alkalinity includes the concentration of OH-, CO3-2, and HCO3-. Therefore, we can calculate the concentration of each as follows:
Total Alkalinity (TA) = T-alkalinity + P-alkalinity
TA = 400 + 250 = 650 mg/l as CaCO3
Concentration of HCO3- = TA - (CO3-2 + OH-)
Hence, HCO3- = 650 - (300 + 0) = 350 mg/l as CaCO3
Concentration of CO3-2 = P-alkalinity
Hence, CO3-2 = 250 mg/l as CaCO3
Concentration of OH- = 0 (as there is no excess of OH- present in the water sample)
Therefore, the concentrations of OH-, CO3-2, and HCO3- in mg/l respectively are 0, 300, and 350. Hence, the correct answer is option C.
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The T-alkalinity in water is 400mg/l as CaCO3 and P-alkalinity is 250mg/l as CaCO3. What will be the concentrations of OH-, CO3-2, HCO3- in mg/l respectively?a)0,100,300b)100,0,300c)100,300,0d)300,100,0Correct answer is option 'C'. Can you explain this answer?
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