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Equilibrium — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistryEquilibrium1 Mark
MCQ
When ammonium chloride is added to ammonia solution, the $\ce{pH}$ of the resulting solution will be :
  • A
    Increased
  • B
    Seven
  • ✓
    Decreased
  • D
    Not changed
✓

Answer

Correct option: C.
Decreased
Common ion effect is observed when a solution of weak electrolyte is mixed with a solution of strong electrolyte which provides an ion common to that provided by a weak electrolyte.
Ammonium hydroxide is a weak electrolyte and ammonium chloride is a strong electrolyte.
Ammonium chloride provides ammonium ion which is common to that provided by ammonium hydroxide.
Thus, the pair $\mathrm{NH}_4 \mathrm{OH}+\mathrm{NH}_4 \mathrm{Cl}$ shows common ion effect. Ammonium chloride suppresses the ionization of ammonium hydroxide.

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