# Problem PageQuestion A chemistry graduate student is given of a benzoic acid solution. Benzoic acid is a weak acid with . What mass

Problem PageQuestion 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  Related Posts