Ch 12.115

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Diego Zavala 2I
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Ch 12.115

Postby Diego Zavala 2I » Thu Dec 07, 2017 3:55 pm

Acetic acid is use as a solvent for some reactions between acids and bases. a) Nitrous acid and carbonic acids are both weak acids in water. Will either of them act as a strong acid in acetic acid? Explain your answer. b) Will ammonia act as a strong or weak base in acetic acid? Explain your answer.

Is HNO2 a strong acid in acetic acid solution because HNO2 has two lone pairs which weaken the O-H bond?
I understand that NH3 will accept an H+ cation from the acetic acid solution to form NH4+, but how can I determine if it will be a strong or weak base?

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Re: Ch 12.115

Postby Chem_Mod » Sat Dec 09, 2017 10:02 am

Hi, Diego,
You need to compare the Ka values for nitrous and acetic acid. As nitrous acid has a larger Ka, it is a stronger acid and thus will behave as an acid. Carbonic acid is a weaker acid and therefore will not act as a strong acid in acetic acid.
For ammonia, you need to compare Kb for ammonia and acetate ion. As ammonia has a larger Kb, it will behave a strong base in acetic acid.

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