Question

In: Chemistry

A 100 mL solution of .400 M Sodium Acetate (NaOAc) mixed with 100 ml of .400 M HCl.

Determine the [H3O+] and [OH-] for the following:

A 100 mL solution of .400 M Sodium Acetate (NaOAc) mixed with 100 ml of .400 M HCl.

Solutions

Expert Solution

When we add HCl to the Sodium Acetate (NaOAc) solution,it forms a buffer solution.

pH for the buffer solution can be calculated by using Handerson's equation.

pH = pKa + log [salt]/[acid]

for acetic acid buffer , pKa = 4.74

we need to calculate [salt] and [acid]

                     NaOAc                     +             HCl                      ------------------>            AcOH         + NaCl

                100ml x 0.4M                        100ml x 0.4M                                                    0                   0

at t=0       = 0.1L x 0.4M                            0.1L x 0.4M                                                  0                   0

                = 0.04moles                              0.04moles                                                     0                   0

after the reaction

                   (0.04-0.04) moles                (0.04-0.04) moles                                          0.04moles   

Hence salt NaOAc reacts completely after the reaction.

We cannot calculate the pH and then [H3o+] and [OH-]


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