Question

The $\left[{OH}^{-}\right]$ of a solution is $1.0\times {10}^{-10}$ M the solution is___________.

• A. acidic
• B. basic
• C. neutral
• D. none of these

Answer 1

The correct option is A acidic

Given $\left[O{H}^{-}\right]=1\times {10}^{-10}$

We know that,

$\left[H^{+}\right]\left[O{H}^{-}\right]={10}^{-14}$

$\left[H^{+}\right][1\times {10}^{-10}]={10}^{-14}$

$\left[H^{+}\right]={10}^{-4}$

We know,

$pH=-\log \left[H^{+}\right]$

$⟹pH=-\log \left[{10}^{-4}\right]$

$⟹pH=-(-4){\log }_{10}^{10}$ $\because {\log }_{10}^{10}=1$

$⟹pH=4$

If $pH$ is between $0$ to $7$, then it is acidic. Here $pH$ of solution is $4$, so it is acidic solution.