What is the pH of a 1×10−4

Question

mol HCl solution?(1 point)
Responses

6
6

4
4

2
2

8

Answer 1

To calculate the pH of a \(1 \times 10^{-4}\) mol/L HCl solution, we first recognize that HCl is a strong acid and dissociates completely in water. This means that the concentration of hydrogen ions \([H^+]\) will be equal to the concentration of the HCl solution, which is \(1 \times 10^{-4}\) mol/L.

The pH is calculated using the formula:

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

Substituting the concentration of hydrogen ions:

\[ \text{pH} = -\log(1 \times 10^{-4}) \]

Calculating this gives:

\[ \text{pH} = -(-4) = 4 \]

Therefore, the pH of the solution is 4.

So the correct response is:

4