ammonia

(ii) Explain with the aid of equations, why ammonia NH3 is considered a weak base while potassium hydroxide is a strong base under aqueous conditions. (3 marks)

not sure how to tackle this question for 3 marks

(ii) Explain with the aid of equations, why ammonia NH3 is considered a weak base while potassium hydroxide is a strong base under aqueous conditions. (3 marks)

not sure how to tackle this question for 3 marks

NH3 partially dissociates whilst the NaOH completely dissociates. So for the question I would write out the equations to show this.

I would write it out the equations but it is kind of hard doing it on my phone

but the idea of partially and completely comes from weak and strong acids right?

weak bases are a bit like weak acids, there is only partial dissociation of the acid. In this example of NH3 it is dissolved in water. The acid is the H20

NH3+ H20 <---> NH4+ + OH-


Strong bases like KOH dissociate fully, like strong acids

KOH-----> K+ + OH-

Any questions?

EDIT: The weak base will produce significantly less OH- ions

You can apply that logic to bases too

Thank you, where have u been for so long

NH3 partially dissociates whilst the NaOH completely dissociates. So for the question I would write out the equations to show this.

I would write it out the equations but it is kind of hard doing it on my phone

NH₃ does not dissociate!! (Well it does, but there is one molecule of NH₂^- for every ~10³⁵ molecules of NH₃)

NH₃ is a weak base because the equilibrium for the following equation lies towards the left.

NH₃ + H₂O <--> NH₄⁺ + HO^-

so for 3 marks

should i state NH3 is a weak base as it partially dissociates to give OH- and KOH is strong base because completely dissociates to form OH-

and for equations should i give the example with NH3 reacting with water to give NH4+ and OH-

and the KOH dissociating to give K+ + OH-