A saturated solution of milk of magnesia, Mg(OH)_2, has a pH of 10.52. What is t

Question

A saturated solution of milk of magnesia, Mg(OH)_2, has a pH of 10.52. What is the hydronium ion concentration of the solution? What is the hydroxide ion concentration? Is the solution acidic or basic? An organic acid has pka = 8.95. what is its Ka value? Where does the acid fit in table 17.3? chloroacetic acid (CICH_2CO_2H) has Ka = 1.41 times 10^-3. What is the value of K_b for the chloroacetate ion (CICH_2CO_2^-)? Does the pH of the solution increase, decrease, or stay the same when you add solid ammonium chloride to a dilute aqueous solution of NH_3? Why? Add solid sodium acetate to a dilute aqueous solution of acetic acid? Why? Add solid NaCI to a dilute a aqueous solution of NaOH? Why? What is the pH of a solution that consists of 0.02 ammonia, NH_3 and 0.02 M ammonium chloride, NH_4CI?

Explanation / Answer

PH   = 10.52

-log[H+] = 10.52

[H+] = 10-10.52

[H+]   = 3.02*10-11 M

Kw   = [H+][OH-]

[OH-] = Kw/[H+]

          = 1*10-14/3.02*10-11

         = 3.3*10-4 M

4. PKa   = 8.95

   -logKa = 8.95

   logka = -8.95

       Ka = 10-8.95

               = 1.12*10-9

5. Kb   = Kw/Ka

          = 1*10-14/1.41*10-3

           = 7.1*10-12

6. no change because of it is a basic buffer solution

     NH3 + NH4Cl

b. no change because of it is a acid buffer solution

   CH3COOH + CH3COONa

c. no change

7. POH   = PKb + log[NH4Cl]/[NH3]

            = 4.75 + log0.2/0.2

            = 4.75 + 0

           = 4.75

PH   = 14-POH

       = 14-4.75   = 9.25 >>>> answer

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