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The total hardness in raw water is 500 milligram per liter as CaCO3. The total hardness of this raw water, expressed in milligram equivalent per liter, is (Consider the atomic weights of Ca, C, and O as 40 g/mol, 12 g/mol, and 16 g/mol, respectively.)
- a)10
- b)100
- c)1
- d)5
Correct answer is option 'A'. Can you explain this answer?
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The total hardness in raw water is 500 milligram per liter as CaCO3. T...
Calculation of Milligram Equivalent per Liter
Total hardness in raw water is 500 milligram per liter as CaCO3. To calculate the milligram equivalent per liter, we need to convert CaCO3 to its equivalent weight.
The equivalent weight of CaCO3 is its molecular weight divided by its valence. The valence of CaCO3 is 2 since Ca has a valence of 2 and there are two Ca atoms in CaCO3.
The molecular weight of CaCO3 is:
Ca = 40 g/mol
C = 12 g/mol
O = 16 g/mol x 3 = 48 g/mol
Total molecular weight = 40 + 48 + 12 = 100 g/mol
The equivalent weight of CaCO3 = 100 g/mol / 2 = 50 g/mol
Now, we can calculate the milligram equivalent per liter:
Milligram equivalent per liter = Total hardness (in mg/L) / Equivalent weight of CaCO3
= 500 mg/L / 50 g/mol
= 10 mg eq/L
Therefore, the correct answer is option A (10).
Total hardness in raw water is 500 milligram per liter as CaCO3. To calculate the milligram equivalent per liter, we need to convert CaCO3 to its equivalent weight.
The equivalent weight of CaCO3 is its molecular weight divided by its valence. The valence of CaCO3 is 2 since Ca has a valence of 2 and there are two Ca atoms in CaCO3.
The molecular weight of CaCO3 is:
Ca = 40 g/mol
C = 12 g/mol
O = 16 g/mol x 3 = 48 g/mol
Total molecular weight = 40 + 48 + 12 = 100 g/mol
The equivalent weight of CaCO3 = 100 g/mol / 2 = 50 g/mol
Now, we can calculate the milligram equivalent per liter:
Milligram equivalent per liter = Total hardness (in mg/L) / Equivalent weight of CaCO3
= 500 mg/L / 50 g/mol
= 10 mg eq/L
Therefore, the correct answer is option A (10).
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The total hardness in raw water is 500 milligram per liter as CaCO3. T...
Total Hardness = 500 mg/l as CaCO3
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The total hardness in raw water is 500 milligram per liter as CaCO3. The total hardness of this raw water, expressed in milligram equivalent per liter, is (Consider the atomic weights of Ca, C, and O as 40 g/mol, 12 g/mol, and 16 g/mol, respectively.)a)10b)100c)1d)5Correct answer is option 'A'. Can you explain this answer?
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