Answer : The
concentration is, 0.0316 M
Explanation :
pH : It is defined as the negative logarithm of hydrogen ion concentration.
First we have to calculate the pOH.
![pH+pOH=14\\\\pOH=14-pH\\\\pOH=14-12.50=1.5](https://img.qammunity.org/2021/formulas/chemistry/middle-school/y1ndeqbhef6nko1yey0fluo2gvz4y0sa5t.png)
Now we have to calculate the
concentration.
![pOH=-\log [OH^-]](https://img.qammunity.org/2021/formulas/chemistry/college/hdm1ob4dj6mx2sy3kobrrj91lzbh3927bk.png)
![1.5=-\log [OH^-]](https://img.qammunity.org/2021/formulas/chemistry/middle-school/aq601r7bftdyw1614zwhx6q07kypbjw13b.png)
![[OH^-]=0.0316M](https://img.qammunity.org/2021/formulas/chemistry/middle-school/x3vti0xbqt5m2ufmoxn5xquhmhut02e6ph.png)
Therefore, the
concentration is, 0.0316 M