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A buffer is constructed by dissolving 2.05 grams of sodium benzoate (144.11 g/mol) and 2.47 grams...

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Chemistry

A buffer is constructed by dissolving 2.05 grams of sodiumbenzoate (144.11 g/mol) and 2.47 grams of benzoic acid (122.12g/mol Ka = 6.50 x 10^-5) in 150.0 mL of distilledwater.  The solution is titrated with 0.500 M NaOH.Calculate the pH of the solution:

a) at the equivalence point  

b) 20.00 mL NaOH before the equivalence point  

c) 20.00 mL NaOH after the equivalence point

Answer & Explanation Solved by verified expert
4.1 Ratings (738 Votes)
moles of sodium benzoate C6H5COONa added mass molar mass 205 g 14411 gmol 00142 mol moles of benzoic acid C6H5COOH added mass molar mass 247 g 12212 gmol 00202 mol Total volume of the solution V 1500 mL 0150 L Hence C6H5COONa 00142 mol 0150 L 00947 M C6H5COOH 00202 mol 0150 L 0135 M a At    See Answer
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