1.

    A solution is prepared by dissolving 0.010.01 moles of NH4ClNH_4Cl and 0.10.1 moles of NH3NH_3 in 11 L of water. If the KbK_b for NH3NH_3 is 1.8imes10−51.8 imes 10^{-5}, what is the approximate pH of the solution?

    A

    4.75

    B

    9.25

    C

    10.25

    D

    11.25

    Question Tags
    📚 Subject:Chemistry
    📑 Chapter:Chemical Equilibrium
    🎯Topic:Acid-Base Theories
    🎓 Ncert Level:Application
    🎯Difficulty :Hard
    ⚡ Time Required :2 mins
    🔄Ncert Concepts :Acid-Base Theories, Buffer Solutions, Henderson-Hasselbalch Equation

    Related Questions

    1.

    A solution is prepared by dissolving 0.010.01 moles of NH4ClNH_4Cl and 0.10.1 moles of NH3NH_3 in 11 L of water. If the KbK_b for NH3NH_3 is 1.8imes10−51.8 imes 10^{-5}, what is the approximate pH of the solution?

    A

    4.75

    B

    9.25

    C

    10.25

    D

    11.25

    Question Tags
    📚 Subject:Chemistry
    📑 Chapter:Chemical Equilibrium
    🎯Topic:Acid-Base Theories
    🎓 Ncert Level:Application
    🎯Difficulty :Hard
    ⚡ Time Required :2 mins
    🔄Ncert Concepts :Acid-Base Theories, Buffer Solutions, Henderson-Hasselbalch Equation

    2.

    Which of the following solutions cannot act as a buffer?

    A

    NaH2PO4+H3PO4{\rm{Na}}{{\rm{H}}_2}{\rm{P}}{{\rm{O}}_4} + {{\rm{H}}_3}{\rm{P}}{{\rm{O}}_4}

    B

    CH3COOH+CH3COONa{\rm{C}}{{\rm{H}}_3}{\rm{COOH}} + {\rm{C}}{{\rm{H}}_3}{\rm{COONa}}

    C

    HCl+NH4Cl{\rm{HCl}} + {\rm{N}}{{\rm{H}}_4}{\rm{Cl}}

    D

    H3PO4+Na2HPO4{{\rm{H}}_3}{\rm{P}}{{\rm{O}}_4} + {\rm{N}}{{\rm{a}}_2}{\rm{HP}}{{\rm{O}}_4}

    Question Tags
    📚 Subject:Chemistry
    📑 Chapter:Chemical Equilibrium
    🎯Topic:Acid-Base Theories
    🎓 Ncert Level:Analyzing
    🎯Difficulty :Medium
    ⚡ Time Required :2 mins
    🔄Ncert Concepts :Buffer solutions, weak acids, weak bases, conjugate pairs, strong acids

    3.

    Which of the following solutions cannot act as a buffer?

    A

    NaH2PO4+H3PO4{\rm{Na}}{{\rm{H}}_2}{\rm{P}}{{\rm{O}}_4} + {{\rm{H}}_3}{\rm{P}}{{\rm{O}}_4}

    B

    CH3COOH+CH3COONa{\rm{C}}{{\rm{H}}_3}{\rm{COOH}} + {\rm{C}}{{\rm{H}}_3}{\rm{COONa}}

    C

    HCl+NH4Cl{\rm{HCl}} + {\rm{N}}{{\rm{H}}_4}{\rm{Cl}}

    D

    H3PO4+Na2HPO4{{\rm{H}}_3}{\rm{P}}{{\rm{O}}_4} + {\rm{N}}{{\rm{a}}_2}{\rm{HP}}{{\rm{O}}_4}

    Question Tags
    📚 Subject:Chemistry
    📑 Chapter:Chemical Equilibrium
    🎯Topic:Acid-Base Theories
    🎓 Ncert Level:Application
    🎯Difficulty :Medium
    ⚡ Time Required :2 mins
    🔄Ncert Concepts :Buffer solutions, weak acids, weak bases, conjugate acid-base pairs, strong acids

    4.

    A physician wishes to prepare a buffer solution at pH=3.58{\rm{pH}} = 3.58 that efficiently resists a change in pH{\rm{pH}} yet contains only small conc. of the buffering agents. Which one of the following weak acid together with its sodium salt would be best to use?

    A

    m−m - chloro benzoic acid (pKa=3.98)\left( {{\rm{p}}{K_a} = 3.98} \right)

    B

    p−p - chlorocinnamic acid (pKa=4.41)\left( {{\rm{p}}{K_a} = 4.41} \right)

    C

    2,52,5-dihydroxy benzoic acid (pKa=2.97)\left( {{\rm{p}}{K_a} = 2.97} \right)

    D

    Acetoacetic acid (pKa=3.58)\left( {{\rm{p}}{K_a} = 3.58} \right)

    Question Tags
    📚 Subject:Chemistry
    📑 Chapter:Chemical Equilibrium
    🎯Topic:Acid-Base Theories
    🎓 Ncert Level:Application
    🎯Difficulty :Medium
    ⚡ Time Required :2 mins
    🔄Ncert Concepts :buffer solutions, pH, pKa, Henderson-Hasselbalch equation

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