Final answer:
To determine the pH of a KOH solution, first calculate the concentration of OH- ions produced by KOH, then find the pOH using -log[OH-], and finally subtract pOH from 14 to get the pH.
Step-by-step explanation:
To calculate the pH of a solution containing 0.0685 moles of KOH in 1.00 L of water, first, we need to know that KOH is a strong base and will dissociate completely in water. The amount of KOH is equal to the amount of hydroxide ions, OH-, in the solution since KOH produces one hydroxide ion per molecule. Therefore, the concentration of OH- is 0.0685 M. To find the pOH, we use the formula pOH = -log[OH-]. After calculating pOH, we can find the pH of the solution since pH + pOH = 14.00 at 25 °C.
The exact steps to calculate pH are as follows:
- Use the formula pOH = -log[OH-] to calculate the pOH of the solution.
- Subtract the pOH value from 14.00 to find the pH.
Once you perform these calculations using the provided concentration of OH-, you will obtain the pH of the KOH solution.