What is the pH of a 1×10−4

Question

mol HCl solution?(1 point)
Responses

2
2

8
8

6
6

4

Answer 1

To find the pH of a 1 × 10⁻⁴ mol/L HCl solution, we need to consider that HCl is a strong acid and dissociates completely in water. Therefore, the concentration of hydrogen ions \([H^+]\) in the solution will be equal to the concentration of the acid.

1. Given concentration of HCl = \(1 × 10^{-4} , \text{mol/L}\)
2. \([H^+] = 1 × 10^{-4} , \text{mol/L}\)

The pH is calculated using the formula:

\[ pH = -\log[H^+] \]

Substituting the concentration:

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

Thus, the pH of a 1 × 10⁻⁴ mol/L HCl solution is 4.