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For the reaction NH4+=H++NH3, the equilibrium constant (Ka) is 5.751010. What is the pK value? At pH of 9 , what is the mole fraction

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For the reaction NH4+=H++NH3, the equilibrium constant (Ka) is 5.751010. What is the pK value? At pH of 9 , what is the mole fraction of NH3 gas of the total ammonium? (4 pts)

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