Acid-Base solutions and their effectiveness for deprotonation of NH4+

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The discussion centers on determining which solution is effective for the deprotonation of NH4+ based on their pH values. Participants debate whether NH4+ should be considered a strong acid and whether the strongest base among the options, identified as solution D with a pH of 11.88, is the correct choice for effective deprotonation. There is confusion regarding the relationship between strong acids and bases, and the significance of pKa in this context. The consensus suggests that while NH4+ is not a strong acid, solution D is still the most effective due to its high pH, indicating it is the strongest base available. Understanding the concepts of pKa and the nature of the acids and bases involved is crucial for accurately approaching the problem.
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Consider the following solutions and their respective pH values. Which substance would be effective(K>1) for the deprotonation of NH4+ ?
0.1 M A, pH = 6.85
0.1 M B, pH = 7.22
0.1 M C, pH = 8.34
0.1 M D, pH = 11.88

1) A
2) B
3) C
4) D
5) none are effective

If the reaction to be effective
doesn't Strong acid have to react with strong base?
since NH4+ is strong acid, I thought it should react with the strongest
base among the four substances,
so i chose D, which has the highest pH value.

Is it right, or am I doing something wrong here?
 
Last edited:
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oh.. NH4+ is not a strong acid..
how do I approach this problem then?

If K>1, net direction is right,
then shouldn't the reactants be stonger acid and stronger base?
 
Last edited:
anyone?
 
Dissociation of ammonium as an acid is weak; I would guess the choice D is the strongest base allowed for you and that would be most effective in deprotonating the ammonium ion. I say it is the strongest base there because all of your choices are 0.1 Molar; and D has the highest pH (therefore most alkaline).
 
i thought NH4+ would be a strong acid. NH3 is a weak base, it's conjugate acid, NH4+ should then be strong.

but you still need the strongest base... therefore D
 
ada0713 said:
Consider the following solutions and their respective pH values. Which substance would be effective(K>1) for the deprotonation of NH4+ ?
0.1 M A, pH = 6.85
0.1 M B, pH = 7.22
0.1 M C, pH = 8.34
0.1 M D, pH = 11.88

1) A
2) B
3) C
4) D
5) none are effective

If the reaction to be effective
doesn't Strong acid have to react with strong base?
since NH4+ is strong acid, I thought it should react with the strongest
base among the four substances,
so i chose D, which has the highest pH value.

Is it right, or am I doing something wrong here?

Why do you think you were given the pH at a particular concentration? Have you studied the concept of pKa? What 'K' was referred to in the question "...(K>1)..."?
 

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