Question

"The [OH-] of a solution with pH = 8.34 is

A. 5×10^-9M.
B. 4.6 × 10^-9 M.
C. 2.2 × 10^-9 M.
D. 3×10^-6M.
E. 2.2 × 10^-6 M."

Answer 1

To calculate the hydroxide ion concentration from the pH of 8.34, we use the relationship pH + pOH = 14 to find the pOH as 5.66, then use the inverse log to find [OH-] = 2.2 × 10^-6 M.

Step-by-step explanation:

To find the hydroxide ion concentration [OH-] for a solution with a given pH, we use the relationship pH + pOH = 14. Since the pH is given as 8.34, we can first find the pOH:

pOH = 14 - pH

pOH = 14 - 8.34

pOH = 5.66

The concentration of hydroxide ions is then determined by the inverse log of the pOH:

[OH-] = 10-pOH

[OH-] = 10-5.66

[OH-] = 2.2 × 10-6 M

Therefore, the correct answer is E. 2.2 × 10-6 M.