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