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Question

Calculate λ∞m for acetic acid.λ∞m (HCl) =426 Scm2mol−1λ∞m (NaCl) =126 Scm2mol−1λ∞m(CH3COONa)=91 Scm2mol−1

A
420 Scm2mol1
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B
329 Scm2mol1
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C
391 Scm2mol1
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D
None of these
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Solution

The correct option is B 391 Scm2mol−1Λ∞m CH3COOH=?Λ∞m (NaCl)=126 Scm2 mol−1Λ∞m (CH3COONa)=91 Scm2 mol−1Λ∞m (HCl)=Λ∞H++Λ∞Cl−=426.....(i)Λ∞m (NaCl)=Λ∞Na++Λ∞Cl−=126.....(ii)Λ∞m (CH3COONa)=Λ∞CH3COO−+Λ∞Na+=91.....(iii)Add equation (i) and (iii) and subtract equation (ii)Λ∞m(CH3COOH)=Λ∞HCl+Λ∞CH3COONa−Λ∞NaCl =Λ∞CH3COO−+Λ∞H+Λ∞mCH3COOH=426+91−126 =391 Scm2mol−1

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