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What is universal indicator? Which is the most accurate method of measuring the pH of a solution?

Answer»
  • In the pH scale, the pH of solutions varies from 0 to 14 in accordance with the strength of the acid or base. 
  • To show these variations in pH, a universal indicator is used. 
  • A universal indicator shows different colours at different values of pH. A universal indicator is made by mixing several synthetic indicators in specific proportions. 
  • The pH of a solution can be determined by means of a universal indicator solution or the pH paper made from it. 
  • However, the most accurate method of measuring the pH of a solution is to use an electrical instrument called pH meter.
  • In this method, pH is measured by dipping electrodes into the solution.


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