chemistry

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Wrtie the equilibrium constant expression for the reaction of NH3 with water. the OH- concentration of .050 M ammonia, NH3, is 9.5 x 10^-4 M

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    NH3(aq) ==> NH4^+ + OH^-

    K = (NH4^+)(OH^-)/(NH3)
    This is the expression; I don't know what the numerical values mean.

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