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JIPMER 2012
Exam
JIPMER
Year
2012
Subject
Chemistry
Chapter
Ionic Equilibrium

JIPMER 2012 · Chemistry · Ionic Equilibrium

Which buffer solution comprising of the following has its pH value...

Which buffer solution comprising of the following has its pH value greater than 7 ?

Options

  1. ACH3COOH+CH3COONa\mathrm{CH}_3 \mathrm{COOH}+\mathrm{CH}_3 \mathrm{COONa}
  2. BHCOOH+HCOOK\mathrm{HCOOH}+\mathrm{HCOOK}
  3. CCH3COONH4\mathrm{CH}_3 \mathrm{COONH}_4
  4. DNH4OH+NH4Cl\mathrm{NH}_4 \mathrm{OH}+\mathrm{NH}_4 \mathrm{Cl}

Correct answer

D. NH4OH+NH4Cl\mathrm{NH}_4 \mathrm{OH}+\mathrm{NH}_4 \mathrm{Cl}

Step-by-step solution

The pH value of basic buffer solutions is always greater than 7. Among the given, only NH4OH+NH4Cl\mathrm{NH}_4 \mathrm{OH}+\mathrm{NH}_4 \mathrm{Cl} constitutes the basic buffer (a mixture of weak base and its conjugated salt), thus, has pH greater than 7 .
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