1. Tardigrade
  2. Question
  3. Chemistry
  4. At 291 K the molar conductivities at infinite dilution of NH4Cl,NaOH and NaCI are 129.8, 217.4 and 108.9 Scm2 respectively,. If the molar conductivity of a centinormal solution of NH4OH is 9.33 Scm2, What is the precentage dissociation of NH4OH at this dilution?

Question Error Report

Thank you for reporting, we will resolve it shortly

Back to Question

Q. At 291 K the molar conductivities at infinite dilution of $ N{{H}_{4}}Cl,NaOH $ and $ NaCI $ are 129.8, 217.4 and $ 108.9\,Sc{{m}^{2}} $ respectively,. If the molar conductivity of a centinormal solution of $ N{{H}_{4}}OH $ is $ 9.33\,Sc{{m}^{2}}, $ What is the precentage dissociation of $ N{{H}_{4}}OH $ at this dilution?

VMMC MedicalVMMC Medical 2013

Solution:

From Kohlrauschs law, $ {{A}^{o}} $ for $ N{{H}_{4}}OH= $ $ A_{NH_{4}^{+}}^{o}+A_{C{{H}^{-}}}^{o}={{A}^{o}}(N{{H}_{4}}Cl)+{{A}^{o}}(NaOH) $ $ -{{A}^{o}}(NaCl)=129.8+217.4-108.9 $ $ =238.3\,S\,c{{m}^{2}} $ Degree of dissociation $ (\alpha )=\frac{{{A}_{c}}}{{{A}^{o}}}=\frac{9.33}{238.3}=0.0392=3.92% $