Calculating Acidic Strength of Concentrated Nitric Acid

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In summary, the acidity of an acid is directly or indirectly proportional to its hydration energy. The stability of the anion formed by an acid is determined by its acidity. Concentration can affect the acidic strength of nitric acid, and it is typically sold as a 70% solution in water. Higher concentrations can also be obtained.
  • #1
daemonakadevil
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acidic strength is directly proportional or indirectly proportional to hydration energy ??

and

how to find that anion formed by aicd is stable or not??

Thanks!
 
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  • #2
What do you mean by "hydration energy"?

Acidic strength is proportional to the amount of hydronium ion formed by a given amount of the acid. It is also defined as the activity (rather than the amount) of the hydrogen ion. All acids that form in an aqueous system can only produce an acid of the same strength as hydronium ion. In non-aqueous systems, the nature of the anion and the nature of the stabilization of the proton in solution determine the strength of the acid. Search "Olah, acids, superacids" for more detail.

The stability of the anion formed by the acid is usually determined by the acidity itself! The more acidic... the more stable. The more completely dissociated... the more stable.
 
  • #3
So how about concentrated nitric acid? How do we calculate its acidic strength?
 
  • #4
pixel01 said:
So how about concentrated nitric acid? How do we calculate its acidic strength?

Strength as a function of concentration is done in the usual way... molarity of nitric acid. Strength expressed as an activity (appropriate for pH) is molality multiplied by the activity coefficient.

Most concentrated nitric acid is sold as 70% solution in water although concentrations of greater than 90% can be obtained as well.
 

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