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a buffer consist of 0.50 M NH3 and .50 M NH4Cl. If .010 mol NaOH is dissolved in 100 mL of this buffer, what is the pH of the resultant solution? Kb = 1.8 x 10^-5 for NH3

a 1.00 liter solution contains 1.00 mol of weak acid HX. After 0.60 mol of Oh- is added to this olution, the pH of the solution is 4.00. Calculate the Ka for the acid HX.

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