Question

The concept of pH was put forward by:
(A) Arrhenius
(B) Lewis
(C) sorensen
(D) Bronsted and Lowry

Answer 1

The concept of pH was introduced at Carlsberg Laboratory in 1909 and revised to the modern pH in 1924 to accommodate definitions and measurements in terms of electrochemical cells.

Complete step by step answer:
-In chemistry, pH is a scale used to specify the acidity or basicity of an aqueous solution. Lower pH values correspond to solutions which are more acidic in nature, while higher values correspond to solutions which are more basic or alkaline. At room temperature $\left( {25^\circ C\;or\;77^\circ K} \right)$ pure water is neutral (neither acidic nor basic) and has a pH of 7.
-The pH scale is logarithmic and inversely indicates the concentration of hydrogen ions in the solution. This is because the formula used to calculate pH approximates the negative of the base 10 logarithm of the molar concentration of hydrogen ions in the solution. More precisely, pH is the negative of the base 10 logarithm of the activity of hydrogen ions.
-At 25°, solutions with a pH less than 7 are acidic, and solutions with a pH greater than 7 are basic, The neutral value of the pH depends on the temperature, being lower than 7 if the temperature increases. The pH value can be less than 0 for very strong acids, or greater than 14 for very strong bases.
-The concept of pH was first introduced by the Danish Chemist Soren Peder Lauritz Sorensen at the Carlsberg Laboratory in 1909 and revised to the modern pH in 1924 to accommodate definitions and measurements in terms of electrochemical cells.

The correct answer will be option (C) Sorenson.

Note:
The pH scale is traceable to a set of standard solutions whose pH is established by international agreements. Primary pH standard values are determined using a concentration cell with transference, by measuring the potential difference between a hydrogen electrode and a standard electrode such as the silver chloride electrode.