Question

What is the relationship between $\left[O{H}^{-}\right]$ and $\left[H_3{O}^{+}\right]$ in a water solution?

• A. When multiplied together, they equal a constant, $K_w$.
• B. When multiplied together, they equal each other.
• C. When divided, they equal a constant, $K_w$.
• D. When one increases, the other increases.
• E. They explain the acidity of a solution.

Answer 1

The correct option is A When multiplied together, they equal a constant, $K_w$.

When $\left[O{H}^{-}\right]$ and $\left[H_3{O}^{+}\right]$ (in a water solution) are multiplied together, they equal a constant, $K_w$ which is ionic product of water with a value of $1\times {10}^{-14}$ at ${25}^{o}C$.

Hence, the correct option is A.