Question

Find the false statement for a solution that has a hydroxide concentration of $1.0\times {10}^{-6}M$ at ${25}^{\circ }C$ ?

• A. $Kw=1\times {10}^{-14}$
• B. The solution is acidic
• C. The solution is basic
• D. The $\left[H^{+}\right]$ is $1\times {10}^{-8}$ M
  
• E. The pOH equals $6.0$

Answer 1

The correct option is B The solution is acidic

The option (B) represents incorrect statement.
$\left[O{H}^{-}\right]={10}^{-6}M\left[H^{+}\right]=\frac{Kw}{\left[O{H}^{-}\right]}=\frac{{10}^{-14}}{{10}^{-6}}={10}^{-8}M<{10}^{-7}M$
Hence, the solution is basic.
$pOH=-log\left[O{H}^{-}\right]=-log{10}^{-6}=6$