a 0.3207g sample of primary standard grade benzoic acid, C6H5COOH, was dissolved in 50.00 ml solution of Ba(OH)2. The ex

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a 0.3207g sample of primary standard grade benzoic acid,
C6H5COOH, was dissolved in 50.00 ml solution of Ba(OH)2. The excess
base required 4.20 mL of 0.1104 M HCl for back titration. Calculate
the molar concentration of the Ba(OH)2 solution.
Preliminary reaction: Ba(OH)2 + 2 C6H5COOH --> Ba(C6H5COO)2 +
2 H2O
Back-titration reaction: Ba(OH)2 + 2 HCl --> BaCl2 + 2
H2O