Question

In: Chemistry

What is the pH of a buffer containing 20.53g benzoic acid and 17.23g sodium benzoate in...

What is the pH of a buffer containing 20.53g benzoic acid and 17.23g sodium benzoate in 500mL of solution?

Solutions

Expert Solution

Molarity of benzoic acid = (mass/molarmass)*(1000/V in mL)

                                       = (20.53/122)*(1000/500)

                                     = 0.336

Molarity of sodium benzoate = (17.23/144)*(1000/500)

                                              = 0.239

pH = pKa + log(salt/acid)

     = 4.20 + log(0.239/0.336)

     = 4.05


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