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Calculate Ph of 0.1 M Hno3

Reviewed by Calculator Editorial Team

Nitric acid (HNO3) is a strong acid that completely dissociates in water. When dissolved in water, it releases hydrogen ions (H+) that determine the solution's acidity. This calculator helps you determine the pH of a 0.1 molar (M) solution of nitric acid using the standard pH calculation method.

How to Calculate pH of 0.1 M HNO3

To calculate the pH of a 0.1 molar solution of nitric acid:

  1. Identify the concentration of the acid solution (0.1 M in this case).
  2. Recognize that nitric acid is a strong acid, so it fully dissociates in water.
  3. Calculate the hydrogen ion concentration ([H+]) using the dissociation constant.
  4. Convert the [H+] concentration to pH using the pH formula.

The result will give you the acidity level of the solution on the pH scale, where lower values indicate higher acidity.

The pH Calculation Formula

pH Formula

The pH of a solution is calculated using the formula:

pH = -log10[H+]

Where [H+] is the concentration of hydrogen ions in moles per liter (M).

For a 0.1 M solution of nitric acid:

  • The concentration of H+ ions is equal to the concentration of the acid because nitric acid fully dissociates.
  • Therefore, [H+] = 0.1 M.
  • Plugging this into the pH formula gives: pH = -log10(0.1).

Worked Example

Let's calculate the pH of a 0.1 M solution of nitric acid step by step:

  1. Given: Concentration of HNO3 = 0.1 M.
  2. Since HNO3 is a strong acid, it completely dissociates: HNO3 → H+ + NO3-.
  3. Therefore, [H+] = [HNO3] = 0.1 M.
  4. Using the pH formula: pH = -log10(0.1).
  5. Calculate the logarithm: log10(0.1) = -1.
  6. Multiply by -1: pH = -(-1) = 1.

The pH of a 0.1 M solution of nitric acid is 1. This indicates a very acidic solution.

Interpreting the pH Result

The pH scale ranges from 0 to 14:

  • pH 0-6: Acidic (lower values are more acidic)
  • pH 7: Neutral
  • pH 8-14: Basic (higher values are more basic)

A pH of 1 for a 0.1 M HNO3 solution means:

  • The solution is extremely acidic.
  • It has a high concentration of hydrogen ions.
  • It would react strongly with bases and metals.

Always handle concentrated nitric acid with caution as it can cause severe burns and is highly corrosive.

Frequently Asked Questions

Is nitric acid a strong or weak acid?
Nitric acid is a strong acid, meaning it completely dissociates in water, releasing all its hydrogen ions.
What does a pH of 1 mean?
A pH of 1 indicates an extremely acidic solution with a high concentration of hydrogen ions.
Can I use this calculator for other strong acids?
Yes, this method works for any strong acid with known concentration, as they all fully dissociate in water.
What safety precautions should I take with nitric acid?
Nitric acid is highly corrosive and can cause severe burns. Always handle it with proper protective equipment and in a well-ventilated area.
How does temperature affect the pH of nitric acid?
The dissociation constant of nitric acid is relatively temperature-independent, so temperature changes have minimal effect on the pH of a given concentration.