eododgy3998 eododgy3998
  • 31-03-2018
  • Chemistry
contestada

The equilibrium concentration of hydroxide ion in a saturated iron(iii) hydroxide solution is

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superman1987
superman1987 superman1987
  • 09-04-2018
when:

Fe(OH)3 ↔  Fe3+    +    3OH-

so, each 1 mol Fe3+ →  3 mol OH-

and when [OH] = 1.2 x 10^-5

∴ [Fe3+] = (1.2 x 10^-5) / 3

               =  4 x 10^-6

when Keq = [Fe3+][OH]^3

                  = (4 x 10^-6) (1.2 x 10^-5)^3

    ∴Keq     = 6.9 x 10^-21
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