How Do You Calculate the pH of a Diluted HNO3 Solution?

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Discussion Overview

The discussion centers on calculating the pH of a diluted nitric acid (HNO3) solution, specifically involving the mixing of a known concentration of HNO3 with water. The scope includes conceptual understanding of pH, the behavior of strong acids, and the calculations involved in determining hydrogen ion concentration.

Discussion Character

  • Homework-related, Conceptual clarification, Technical explanation

Main Points Raised

  • One participant asks for assistance in calculating the pH of a solution made by mixing HNO3 with water.
  • Another participant explains that pH is the negative logarithm of the hydrogen ion concentration and prompts the original poster to calculate this concentration.
  • A participant questions whether nitric acid dissociates completely in solution.
  • Another participant confirms that it is safe to assume that nitric acid completely dissociates.

Areas of Agreement / Disagreement

Participants generally agree that nitric acid is a strong acid and dissociates completely, but the calculation of pH and the specific concentration of hydrogen ions in the mixed solution remains unresolved.

Contextual Notes

Limitations include the need for clarity on the calculation steps for determining the final concentration of hydrogen ions after dilution, as well as the assumptions made regarding complete dissociation.

geffman1
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hey guys, I've just started PH, just wondering if you could show me how to do this question. thanks for any help

What is the pH of a solution made by mixing 800 mL of 0.01 M HNO3 and 700.75 mL of water?
 
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Nitric acid is a strong acid - what does this mean?
pH means "negative logarithm of the hydrogen ion concentration in Molarity", at least for practical purposes - Did you yet calculate the hydrogen ion concentration in your given solution?

note: the logarithm is in 'base ten'
 
Last edited:
does that mean it dissociates completely?
 
Yes, you may safely assume it is completely dissociated.
 

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