Question

A solution of HCl is made by dissolving .005 moles of HCl in 50 L of water. What is the pH of the solution? What is the pOH?

PH?
0.0001
4.00
11.00
2.3p
pOH?
2.00
4.00
10.00
12.00​

Answer 1

pH= 4; pOH= 10

Step-by-step explanation:

HCl is a strong acid and therefore dissociates completely in a solution of water via HCl + H2O --> Cl- + H3O+.

Because it is a strong acid, [HCl] = [H3O+].

[HCl]= [H3O+]= (0.005 mol)/(50L)= 1.0 x 10^-4

pH= -log[H3O+]

pH= -log(1.0 x 10^-4)= 4

pH + pOH = 14

4 + pOH = 14

pOH= 10