Q47.The hardness of a water sample containing 10−3 M MgSO4 expressed as CaCO3 equivalents (in ppm ) is . (molar mass of MgSO4 is 120.37 g/mol )
What This Question Tests
This question tests the ability to calculate the hardness of water due to a given salt (MgSO4) and express it in ppm of CaCO3 equivalents, a common unit for water quality.
Concepts Tested
Formulas Used
Hardness (ppm CaCO3) = Molarity of ion * Molar mass of CaCO3 * 1000
📚 NCERT Sections This Tests
1.27 — If The Solubility Product Of Cus Is 6 × 10–16, Calculate The Maximum Molarity Of
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1.27 If the solubility product of CuS is 6 × 10–16, calculate the maximum molarity of CuS in aqueous solution.
1.3 — Define The Following Terms:
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1.3 Define the following terms: (i) Mole fraction (ii) Molality (iii) Molarity (iv) Mass percentage.
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1.35 Henry’s law constant for the molality of methane in benzene at 298 K is 4.27 × 105 mm Hg. Calculate the solubility of methane in benzene at 298 K under 760 mm Hg.
📋 Question Details
- Chapter
- Environmental Chemistry
- Topic
- Hardness of water (CaCO3 equivalents)
- Year
- 2020
- Shift
- 09 Jan Shift 1
- Q Number
- Q47
- Type
- Numerical
- NCERT Ref
- Class 11 Chemistry Ch 14: Environmental Chemistry
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