Answer :
The most appropriate indicator for titrating aqueous aniline solutions is methyl red with a pH of 5.87.
Aniline (a weak base) when titrated with a strong acid will neutralize at a pH of less than 7.
The reaction will be
B + H⁺ → BH⁺ + Cl⁻
BH+ will hydrolyze as:
BH⁺+ H₂O ⇄ B + H₃O⁺
Ka conjugate acid aniline = 10⁻¹⁴/7.4 x 10⁻¹⁰ = 1.35 x 10⁻⁵
pKa = 4.87
Probable pH at the equivalence point = 4.87 + 1.00 = 5.87
The most appropriate indicator is methyl red with a pH equivalent point of 5–6.
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