Final answer:
To obtain the pH of the solution with a hydroxide ion concentration of 1.3 x 10-12 M at 25.0 °C, calculate the pOH as -log[OH-] and then use 14.00 = pH + pOH to find that the pH is approximately 2.11.
Step-by-step explanation:
The student asked for the pH of a solution with a hydroxide (OH⁻¹) ion concentration of 1.3 x 10⁻²⁸ M at 25.0 ℃.
To find the pH, one typically first calculates the pOH of the solution using the formula pOH = -log[OH⁻¹], and then applies the relationship 14.00 = pH + pOH to find the pH.
To compute the pOH: pOH = -log(1.3 x 10⁻²⁸) = 11.89 approximately.
Then to find the pH: pH = 14.00 - pOH
= 14.00 - 11.89
= 2.11 approximately.