What is the exact definition of a 'salt'?

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Discussion Overview

The discussion revolves around the definition of a 'salt' in chemistry, particularly in the context of its classification as an ionic compound resulting from the neutralization of an acid and a base. Participants explore the nuances and complexities of this definition, including specific examples and the implications of varying definitions.

Discussion Character

  • Debate/contested
  • Conceptual clarification
  • Technical explanation

Main Points Raised

  • One participant cites Wikipedia's definition of salts as ionic compounds formed from the neutralization of acids and bases, using the reaction of Al(OH)3 and HCl as an example.
  • Another participant questions the classification of AlCl3 as a salt, noting that it is primarily covalent and thus does not fit the traditional definition of a salt.
  • Some participants argue that the lack of a clear definition for salts reflects the complexity of chemical classifications, suggesting that rigid definitions may not accommodate all compounds effectively.
  • There is a discussion about the implications of having non-uniform definitions, with concerns raised about how this affects conceptual clarity in chemistry.
  • One participant draws a parallel between the classification of salts and the nature of chemical bonds, suggesting that while definitions can be useful, they may not capture the continuous nature of chemical properties.

Areas of Agreement / Disagreement

Participants express disagreement regarding the definition and classification of salts, with some advocating for a more flexible understanding while others emphasize the need for clear definitions. The discussion remains unresolved, with multiple competing views presented.

Contextual Notes

Participants acknowledge that the definitions of acids, bases, and salts may vary based on context, such as organic versus inorganic chemistry, and that solubility in water adds another layer of complexity to the classification.

Ashu2912
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What is the exact definition of a 'salt'? This question is bugging me from a long time. Thanks!
 
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http://en.wikipedia.org/wiki/Salt_(chemistry )
 
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From Wikipedia : In chemistry, salts are ionic compounds that result from the neutralization reaction of an acid and a base.

Consider Al(OH)3 + 3HCl -> AlCl3 + H2O

In the above reaction:-
(1)Al(OH)3 is a base?? Yes, an Arrhenius Base...
(2)HCl is an acid?? Yes, a Arrhenius acid...
(3)The reaction is neutralization reaction? Yes.
(4)Is AlCl3 ionic?? No, it is primarily covalent...

So as per the above definition, AlCl3 shouldn't be a salt right? But it is so...
 


Problem is, reality doesn't want to be black and white, there are all possible shades of gray in between. It is convenient to classify AlCl3 as a salt, even if - as you correctly mentioned - it doesn't meet all conditions. Alternative is to either create individual classes for many compounds, or to throw them into "others" bag. Each approach has its pluses and minuses.
 


You mean to say that there is no perfectly clear definition for all things? But then won't this hinder concept clarity? As in : If the concept itself is not defined uniformly for all cases, how may we have the clarity of concept? Thanks for your time...
 


Ashu2912 said:
You mean to say that there is no perfectly clear definition for all things? But then won't this hinder concept clarity? As in : If the concept itself is not defined uniformly for all cases, how may we have the clarity of concept? Thanks for your time...
Neutralization reactions between acids and bases make salts (in general). Are the acids and bases organic? Are they inorganic? Are the salts readily soluble in water? There's a lot of wiggle-room out there.
 


Ashu2912 said:
You mean to say that there is no perfectly clear definition for all things? But then won't this hinder concept clarity? As in : If the concept itself is not defined uniformly for all cases, how may we have the clarity of concept? Thanks for your time...

You can have clear definitions in math, but the reality is continuous, so too precise definitions are useless.

Take a look at a bond. We say it can be covalent, it can be ionic... does it mean every bond is EITHER covalent or ionic? No, each bond is a mix of both, sometime covalent character is prevailing, sometimes bond is more ionic. If you will look for a perfectly ionic bond, you will find not a single one, same with covalent bonds. Still, this classification is quite useful, as it allows us to group together bonds that behave in a similar way.
 

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