question_answer 1)

  Which of the following will produce a buffer solution when mixed in equal volumes? (a) \[0.1mol\,d{{m}^{-3}}N{{H}_{4}}OH\,and\,0.1mol\,d{{m}^{-3}}HCl\] (b) \[0.05mol\,d{{m}^{-3}}N{{H}_{4}}OH\,and\,0.1mol\,d{{m}^{-3}}HCl\] (c) \[0.1mol\,d{{m}^{-3}}N{{H}_{4}}OH\,and\,0.05mol\,d{{m}^{-3}}HCl\]               (d) \[0.1mol\,d{{m}^{-3}}C{{H}_{4}}COONa\,and\,0.1mol\,d{{m}^{-3}}NaOH\]

Answer:

  (c) When \[0.1mol\,d{{m}^{-3}}N{{H}_{4}}OH\] is mixed with \[0.05\,mol\,d{{m}^{-3}}HCl\] of\[HCl\] (equal volume) then we get mixture of \[N{{H}_{4}}OH\] and\[N{{H}_{4}}Cl\], and it will act as buffer solution.