Final answer:
To find the pH of a solution with an [OH-] of 3.4x10^-5 M, calculate the pOH using the negative logarithm of the [OH-], and then subtract that value from 14 to determine the pH, indicating the solution's acidity or alkalinity.
Step-by-step explanation:
The pH of a solution where the hydroxide ion concentration [OH-] is 3.4x10^-5 M can be calculated using the relationship between pH and pOH, which is represented by the equation pH + pOH = 14. First, we need to find the pOH by taking the negative logarithm of the hydroxide ion concentration.
pOH = -log [OH-] = -log (3.4 × 10^-5)
After calculating the pOH, we use the relationship to find the pH:
pH = 14 - pOH
Thus, we can find the pH of the solution which will indicate how acidic or alkaline the solution is.