# Determining the Molar Concentration of a Nitric Acid Solution

## Understanding the Relationship between pH and Molar Concentration

**pH** is a measure of how acidic or basic a solution is and is defined as the negative logarithm (base 10) of the concentration of hydrogen ions [H+] in the solution. The lower the pH value, the higher the concentration of hydrogen ions and the more acidic the solution.

## Calculating Molar Concentration from pH

To determine the molar concentration of a nitric acid solution with a pH of 1.75, we can use the pH formula: **pH = -log[H+]**. By rearranging the formula, we can calculate the hydrogen ion concentration [H+]: [H+] = 10^-pH.

## Calculation Steps

1. pH = 1.75

2. [H+] = 10^-1.75

3. [H+] ≈ 1.78 × 10^-2 M

## Conclusion

The molar concentration of the nitric acid solution with a pH of 1.75 is approximately 1.78 × 10^-2 M. This value represents the concentration of hydrogen ions in the solution, indicating its acidic nature.