Civil Engineering > GATE 2026 SET-2 > Water Chemistry
The analysis of major cations and anions in a water sample collected from a city's water supply is given below. Ions present in minor concentrations are not given.
HCl ⇌ H⁺ + Cl⁻, pK = −3
H₂SO₄²⁻ ⇌ 2H⁺ + SO₄²⁻, pK = −3
H₂CO₃ ⇌ H⁺ + HCO₃⁻, pK = 6.3
HCO₃⁻ ⇌ H⁺ + CO₃²⁻, pK = 10.3
HOCl ⇌ H⁺ + OCl⁻, pK = 7.5
HOCl (in %) present in the total free chlorine in the water is _____ (rounded off to the nearest integer).
| Anions | Concentration (mM) |
|---|---|
| Cl− | 1.5 |
| SO42− | 0.5 |
| HCO3− | 1.0 |
| CO32− | 0.01 |
| Cations | Concentration (mM) |
|---|---|
| Na+ | 2 |
| Ca2+ | 0.5 |
| Mg2+ | 0.25 |
| K+ | 0.02 |
H₂SO₄²⁻ ⇌ 2H⁺ + SO₄²⁻, pK = −3
H₂CO₃ ⇌ H⁺ + HCO₃⁻, pK = 6.3
HCO₃⁻ ⇌ H⁺ + CO₃²⁻, pK = 10.3
HOCl ⇌ H⁺ + OCl⁻, pK = 7.5
HOCl (in %) present in the total free chlorine in the water is _____ (rounded off to the nearest integer).
Correct : 0
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