If you mixed 5.50 ml of the acidic solution with 6.79 ml of the basic solution, what should be the ph of the resulting solution? report your answer with 3 decimal places. note: the pka for acetic acid is 4.757. the activity coefficients for acetic acid and the acetate ion are 1.000 and 0.775, respectively, in a solution with an ionic strength of 0.10 m.

Answer : The  pH of the resulting solution is 4.6

Explanation : Given,

Activity coefficient for acetic acid = 1.000

Activity coefficient for acetate ion = 0.775

Ionic strength = 0.10 M

To calculate the pH of resulting solution we are  using Henderson Hesselbach equation :

Now put all the given values in this expression, we get:

Thus, the pH of the resulting solution is 4.6

the answer would be b i believe