Q7 of 45 Page 2

Why common indicators cannot determine pH value of a solution?

  1. Common indicators, such as litmus; methyl orange and phenolphthalein can easily tell, us whether a solution is acidic or alkaline, but they cannot easily tell how much a given acidic solution is stronger than another acidic solution.
  2. It means they cannot really tell us the pH value of different acidic or alkaline solutions.
  3. In case of litmus, we cannot tell about pH values of 5, 6 and 7. Similarly, in case of methyl orange pH values between 3 and 8 will not be very accurate.

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