How to identify whether a molecule is acting as abase or acid from a raection?
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Many Bronsted acid and bases are easy to recognize because they have an obvious place to donate or accept a proton (e.g. HCl and KOH are easy) and some amphiprotic compounds are also easy (e.g. H2Oand HCO3)
UNDERSTAND IT CAREFULLY
If the structure of a compound is set before me and I am to predict its acid/base chemistry, I will ask two questions:
Are there any lone pair electrons that can be donated?Are there any electron-deficient atoms that could serve as electron pair acceptors?
If the answer to question 1 is yes, then the molecule can behave as a base. If the answer to question 2 is yes, then the molecule is an acid. If both are true, then I have an amphoteric substance.
UNDERSTAND IT CAREFULLY
If the structure of a compound is set before me and I am to predict its acid/base chemistry, I will ask two questions:
Are there any lone pair electrons that can be donated?Are there any electron-deficient atoms that could serve as electron pair acceptors?
If the answer to question 1 is yes, then the molecule can behave as a base. If the answer to question 2 is yes, then the molecule is an acid. If both are true, then I have an amphoteric substance.
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