Question

A solution has a pH of $6.0$. What is the concentration of $O{H}^{-}$ ions in the solution?

• A. $6.0\times {10}^{-14}M$
• B. $1.0\times {10}^{-6}M$
• C. $1.0\times {10}^{-14}M$
• D. $6.0\times {10}^{-8}M$
• E. $1.0\times {10}^{-8}M$

Answer 1

Answer: (E)

$1.0\times {10}^{-8}M$

Given $pH=6$

$\therefore pOH=8(\because pH+pOH=14)$

Now, $pOH=-lo{g}_{10}\left[O{H}^{-}\right]$

$\therefore \left[{OH}^{-}\right]={10}^{-8}M$