Correct Answer: Option B

Explanation

pH = - log [0.25]
        = - log[ \(\frac{25}{100}\) ]
        = - (log 25 - log 100)

        = - ( 1.397 - 2) 

        = - ( - 0.60)

  pH  = 0.60

N.B : You can use your mathematical table, to check for log 25, if you don't have log on your calculator. Already with our knowledge of lorithm, log 100 = 2.

Thus we were asked to find pOH not pH. However, there is relationship between the two as:

pH  +  pOH  = 14

0.60  +  pOH = 14

pOH = 14 - 0.60

pOH = 13.40

There is an explanation video available below.

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