Achieve 6D question 5

[Alyssa Bilinsky 2B]

Hey! Does anyone how to solve this problem? The question is to calculate percent protonation, pH, and pOH given that the aqueous solution is .057 M NH3. How would I solve this if I do not know the Ka value?

[morganm]

Look at section 6C & pay attention to tables 6C.1 and 6C.2. They should provide you with the appropriate Ka values.

[nadiashaw3K]

After finding the corresponding Kb value for NH3 from the table, you could use the equation NH3 + H2O ⇌ NH4+ + OH-. From there, you could use the initial concentration of 0.057 M NH3 and create an ICE table to find the equilibrium concentration of OH-, which can be used to find the pOH and pH. Percent protonation can be found through dividing the equilibrium concentration of the protonated species (NH4+) by the initial concentration of the deprotonated species (NH3) and multiplying by 100.