Question

In: Chemistry

Part A Determine the [H3O+] of a 0.250 M solution of formic acid. Express your answer...

Part A Determine the [H3O+] of a 0.250 M solution of formic acid. Express your answer using two significant figures.

Part B

Determine pH of this solution of formic acid.

Express your answer to two decimal places.

Solutions

Expert Solution

   HCOOH + H2O ----------> HCOO- + H3O+

         I         0.25                                    0            0

         C        -x                                       +x           +x

         E      0.25-x                                  +x            +x

         Ka     = [HCOO-][H3O+]/[HCOOH]

       1.77*10^-4    = x*x/0.25-x

     1.77*10^-4 *(0.25-x) = x^2

         x = 0.00656

      [H3O+] = x = 0.00656M

    PH   = -log[H3O+]

            = -log0.00656

           = 2.183

   


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