Question

when was the first time that someone used an indicator to find the ph of substances?

Answer 1

Søren Sørensen

Søren SørensenSuch was the case with the concept of pH, introduced in 1909 by Søren Sørensen as a convenient way of expressing acidity—the negative logarithm of hydrogen ion concentration.

Answer 2

Explanation:

SOLUTION

As the  has to be maintained between  and , the indicator used can be Bromothymol blue or Phenol red or Cresol red.