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Ionic Equilibrium question

2019 · 9 Jan · Shift 2 · Q19
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  5. /2019 · 9 Jan · Shift 2 · Q19

Ionic Equilibrium question

2019 · 9 Jan · Shift 2 · Q19

JEE MainChemistryIonic EquilibriumMCQ+4 / −1
The pH of rain water, is approximately :
  1. A
    5.6
  2. B
    7.5
  3. C
    7.0
  4. D
    6.5
View written solutionFree

Correct answer: A

  1. Why rain water is not exactly neutral

    Pure water at 25∘C25^\circ\text{C}25∘C has pH=7\text{pH} = 7pH=7 if no acidic or basic gases are dissolved in it.

  2. Effect of atmospheric carbon dioxide

    Rain water dissolves a small amount of atmospheric CO2\text{CO}_2CO2​.

    CO2+H2O⇌H2CO3\text{CO}_2 + \text{H}_2\text{O} \rightleftharpoons \text{H}_2\text{CO}_3CO2​+H2​O⇌H2​CO3​

    Carbonic acid formed makes rain water slightly acidic.

  3. Approximate pH of normal rain water

    Due to dissolved CO2\text{CO}_2CO2​, the pH of natural rain water is approximately pH≈5.6\text{pH} \approx 5.6pH≈5.6

  4. Evaluation of options

    • A: 5.65.65.6 — Correct
    • B: 7.57.57.5 — Basic, not normal rain water
    • C: 7.07.07.0 — Neutral, but rain water is slightly acidic
    • D: 6.56.56.5 — Slightly acidic, but standard approximate value is 5.65.65.6

  5. Final answer

    The approximate pH of rain water is: 5.6\boxed{5.6}5.6​

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