At what molar concentration of aqueous nitrouse acid (`K_a = 4.5x10^(-4))` the pH of the aqueous solution is 2.

Explanation

To find the molar concentration of aqueous nitrous acid (HNO2) at which the pH of the solution is 2, we can follow these steps:

### Step 1: Calculate the [H⁺] concentration from the pH.
The pH is given as 2. We can use the formula:

\[ \text{pH} = -\log[\text{H}^+] \]
...