A chemistry graduate student is given of a benzoic acid solution. Benzoic acid is a weak acid with . What mass of should the student dissolve in the solution to turn it into a buffer with pH ? You may assume that the volume of the solution doesn't change when the is dissolved in it. Be sure your answer has a unit symbol, and round it to significant digits.

Complete Question

A chemistry graduate student is given 125.mL of a 1.00M benzoic acid HC6H5CO2 solution. Benzoic acid is a weak acid with . What mass of KC6H5CO2 should the student dissolve in the HC6H5CO2 solution to turn it into a buffer with pH =4.63? You may assume that the volume of the solution doesn't change when the KC6H5CO2 is dissolved in it. Be sure your answer has a unit symbol, and round it to 2 significant digits.

The mass would be  

Explanation:

   From the question we are told that

           concentration of benzoic acid is

            The volume of benzoic acid is

            The value of the experimental parameter is

          The value of PH is

Generally the number of moles is mathematically represented as

             No of moles = concentration * volume  

Substituting values

 Generally PH is mathematically represented as

Where is the No of moles of and is the number of moles of benzoic acid

Generally the number of moles is mathematically represented as

For

         Molar mass of = 160g/mole

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