3. Calculate the [H3O+], [OH-], pH, and pOH of a 0.120 M HNO2  (nitrous acid).  Ka = 7.10 x 10-4

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3. Calculate the [H3O+], [OH-], pH, and pOH of a 0.120 M HNO2  (nitrous acid). 

Ka = 7.10 x 10-4

4. Calculate the [OH-], [H3O+], pOH and pH of a 0.0750 M NH3

Ka  NH4 = 5.70 x 10 -10 

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