Correct Answer: Option A

Explanation

Given: 

Concentration of  OH = [OH\(^-\)] =  0.001 M 

At 25\(^0\)C,    pH +  pOH = 14

Hence, to find pH of KOH, we need to find the pOH first, then substitute the value into the equation above.

Recall, pOH = - Log [OH\(^-\)]

                    = - Log [0.001]

                    = - ( - 3)

          pOH  = 3

pH  +  pOH = 14

pH  + 3 = 14

pH = 14 - 3 = 11

;. pH = 11 - option A

There is an explanation video available below.

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