Final answer:
The hydrogen ion concentration ([H+]) of a solution with a pOH of 4 is determined by first calculating the pH, which is 10, and then using the pH to find the [H+] concentration, which is 1.0 × 10^-10 M.
Step-by-step explanation:
If the pOH of a solution is 4, we can find the hydrogen ion concentration ([H+]) of the solution by first using the relationship between pH and pOH. The formula for their relationship is:
pH + pOH = 14
Given that the pOH is 4, we can calculate the pH:
pH = 14 - pOH
pH = 14 - 4
pH = 10
To find the hydrogen-ion concentration, we use the formula for pH:
pH = -log [H+]
By inversing the pH value, we can find the [H+] concentration:
[H+] = 10-pH
[H+] = 10-10
Therefore, the hydrogen ion concentration of a solution with a pOH of 4 is 1.0 × 10-10 M.