Determine the pH of the solution

Chemistry
9th Edition
ISBN:9781133611097
Author:Steven S. Zumdahl
Publisher:Steven S. Zumdahl
Chapter15: Acid-base Equilibria
Section: Chapter Questions
Problem 7ALQ: You have a solution of the weak acid HA and add some HCl to it. What are the major species in the...
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The equilibrium constant for an acid is called the acid ionization constant (Ka). If acetic acid (weak acid, HC2H3O2) is placed into water, it ionizes to H+ and C2H3O2- with a Ka of 1.82 x 10-5. Determine the pH of the solution when 20.0 g HC2H3O2 (s) is added to water, with a final volume of 1000. mL?

Expert Solution
Step 1

According to question

Ka = 1.82 x 10-⁵

Mass of acetic acid = 20.0 g

Molar mass = 60.05g/mol 

No. Of moles = 20/60.5 = 0.33057

Molarity of solution = no. Of moles/ vol(L)

           = 0.33057/1 = 0.33057M 

 

 

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