Concentration of [H+] ions in a solution

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SUMMARY

The concentration of H+ ions in a nitric acid solution is determined by the moles of H+ ions from the acid divided by the total volume of the solution. In diluted solutions, the contribution of H+ ions from water dissociation is significant, while in concentrated solutions (greater than 5x10-7 M), this contribution can be ignored. For nitric acid concentrations approaching 1M, it is crucial to consider that the acid is not fully dissociated, and the ionic strength of the solution becomes a critical factor in determining the effective concentration of H+ ions.

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Trooper100
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Hey guys, just a quick question:

If you have a solution of nitric acid, and if you were asked to find the concentration of H+ ions in the solution, would you find the concentration of H+ ions in the acid plus in the water?

Re-wording of question: you find the moles of H+ ions in acid + plus, then divided by total volume (if asked for molarity).
 
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In general yes.

See pH of strong acid (base) solution.

In a diluted solution H+ from water dissociation is important, in more concentrated ones (that is, concentration higher than about 5x10-7) it can be safely ignored.

In the case of nitric acid once its concentration gets close to 1M you have to remember it is not 100% dissociated, although at this stage ionic strength of the solution plays much more important role.
 
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