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NEET2018ChemistryIonic EquilibriumActual

Calculate ionisation constant for pyridinium hydrogen chloride. (Given that H ⁺ ion concentration is 3.6 10⁻⁴ M and its concentration is 0.02 M .)

Options

  1. A6.48 10⁻²
  2. B6 10⁻⁶
  3. C1.5 10⁻⁹
  4. D12 10⁻⁸

Correct answer

C. 1.5 10⁻⁹

Step-by-step solution

Pyridinium hydrochloride is a salt of weak base and strong acid. aligned & pH =- [ H ⁺ ]=- (3.6 10⁻⁴ )=3.44 & Now, pH =- 1 2 [ K_w- K_a+ C ) & 3.44=- 1 2 [-14- K_a+ (2 10⁻² ) ] & 6.88=14+ K_a+1.70 & K_a=-8.82 & K_a= antilog (-8.82)=1.5 10⁻⁹ aligned

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