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The ionization constant of benzoic acid is 6.46 × 10–5 and Ksp for silver benzoate is 2.5 × 10–13. How many times is silver benzoate more soluble in a buffer of pH 3.19 compared to its solubility in pure water?

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Since pH = 3.19, 

Let the solubility of C6H5COOAg be x mol/L. 

Then, 

Thus, the solubility of silver benzoate in a pH 3.19 solution is 1.66 × 10–6 mol/L. Now, let the solubility of C6H5COOAg be x’ mol/L. 

Hence, C6H5COOAg is approximately 3.317 times more soluble in a low pH solution. 

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