Problem: If Kb for NX3 is 4.5×10−6, what is the pOH of a 0.175 M aqueous solution of NX3?Express your answer numerically.

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We are being asked to calculate the pOH of a 0.175 M aqueous solution of NX3


NX3 has a low Kb, therefore we know that it is a weak base.


Since we’re dealing with a weak base and Kb is an equilibrium expression, we will have to create an ICE chart to determine the equilibrium concentration of each species:

NX3weak baseproton acceptor
H2O → will act as the weak acidproton donor


Equilibrium reaction:       NX3(aq) + H2O(l)  NX3H+(aq) + OH-(aq)

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Problem Details

If Kb for NX3 is 4.5×10−6, what is the pOH of a 0.175 M aqueous solution of NX3?

Express your answer numerically.

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Our tutors have indicated that to solve this problem you will need to apply the Weak Bases concept. If you need more Weak Bases practice, you can also practice Weak Bases practice problems.