Question

The hydronium ion concentration of a solution is $1\times {10}^{-4}Mat{25}^{0}C$. The hydroxide ion concentration in the same solution is:

• A. $1\times {10}^{-14}M$
• B. $1\times {10}^{-7}M$
• C. $1\times {10}^{-10}M$
• D. $1\times {10}^{-4}M$

Answer 1

The correct option is C $1\times {10}^{-10}M$

$\left[H_3{O}^{+}\right]\left[O{H}^{-}\right]=1.0\times {10}^{-14}$ at ${25}^{0}C$.

Here, $\left[H_3{O}^{+}\right]=1\times {10}^{-4}$
So, $\left[O{H}^{-}\right]={10}^{-10}$