Sign in
12thPass logo
New chatPYQ LibraryDoubtsRank report
Sign in to see Recents

Your guest activity stays on this device

Sign in to save progress →
Sign in

Ionic Equilibrum question

2011 · Q107
Guest · filters and generic practice availableBrowsing as a guest · PYQ filters and generic practice are available. Sign in only for personalised features and saved progress.
  1. PYQ Library
  2. /NEET
  3. /Chemistry
  4. /Ionic Equilibrum
  5. /2011 · Q107

Ionic Equilibrum question

2011 · Q107

NEETChemistryIonic EquilibrumMCQ+4 / −1
A buffer solution is prepared in which the concentration of NH3 is 0.30 M and the concentration of NH+4 is 0.20 M. If the equilibrium constant, Kb for NH3 equals 1.8 ×\times× 10−-−5, what is the pH of this solution? (log 2.7 = 0.43)
  1. A
    9.08
  2. B
    9.43
  3. C
    11.72
  4. D
    8.73
View written solutionFree

Correct answer: B

pOH = pKb + log [Salt][Base]{{\left[ {Salt} \right]} \over {\left[ {Base} \right]}}[Base][Salt]​

= – log Kb + log [Salt][Base]{{\left[ {Salt} \right]} \over {\left[ {Base} \right]}}[Base][Salt]​

= – log 1.8× 10–5 + log 0.200.30{{0.20} \over {0.30}}0.300.20​

= 5 – 0.25 + (–0.176) = 4.57

Now, pH = 14 – pOH = 14 – 4.57 = 9.43

PreviousNext

More from Ionic Equilibrum

  • Which of the following is least likely to behave as Lewis base?2011 · MCQ
  • What is [H+] in mol/L of a solution that is 0.20 M in CH3COONa and 0.10 M in CH3COOH? Ka for CH3COOH = 1.8 × 10−52010 · MCQ
  • If pH of a saturated solution of Ba(OH)2 is 12, the value of its Ksp is2010 · MCQ
  • In a buffer solution containing equal concentration of B− and HB, the Kb for B− is 10−10. The pH of buffer solution is2010 · MCQ
  • What is the [OH−] in the final solution prepared by mixing 20.0 mL of 0.050 M HCl with 30.0 mL of 0.10 M Ba(OH)2?2009 · MCQ
  • The ionization constant of ammonium hydroxide is 1.77 × 10−5 at 298 K. Hydrolysis constant of ammonium chloride is2009 · MCQ
  • Which of the following molecules acts as a Lewis acid?2009 · MCQ
  • Equal volumes of three acid solutions of pH 3, 4 and 5 are mixed in a vessel. What will be the H+ ion concentration in the mixture?2008 · MCQ