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Ammonia,is a weak base with a Ka value of 1.8x10^-5 .What is the pH of a 0.22M ammonia solution?

  • chem help -

    Ammonia,is a weak base with a Kb value of 1.8x10^-5 .What is the pH of a 0.22M ammonia solution?

  • chem help -

    sorry the 2nd question is the right one

  • chem help -

    NH3 + HOH ==> NH4^+ + OH^-
    Kb = (NH^+)(OH^-)/(NH3)
    Do an ICE chart and plug into the expression for Kb. I get pOH = about 2.7 and pH = about 11.3 but you need to go through and not estimate as I did.

  • chem help -

    ok thanks alot...
    the PartB asks for:

    What is the percent ionization of ammonia at this concentration?

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