Question

Which of the following solutions has pH equal to 10?

• A. ${10}^{-4}MKOH$
  
  
  
• B. ${10}^{-10}MKOH$
  
  
• C. ${10}^{-8}MKOH$
  
• D. ${10}^{-4}MHCl$

Answer 1

The correct option is A ${10}^{-4}MKOH$




$\left[O{H}^{-}\right]={10}^{-4}M$
$pOH=-log\left[O{H}^{-}\right]$
$=-log\left[{10}^{-4}\right]=4$
pH = 14 - pOH = 14 - 4 = 10