who had introduced this scale?
Søren Peder Lauritz Sørensen
PH
The concept of pH was first introduced by the Danish chemist Søren Peder Lauritz Sørensen at the Carlsberg Laboratory in 1909 and revised to the modern pH in 1924 to accommodate definitions and measurements in terms of electrochemical cells. 
na is the symbol for which of the following chemical elements Sodium what is the historical story of this? In medieval Europe, a compound of sodium with the Latin name of "sodanum" was used as a headache remedy. apart from food, where else is it used? Sodium chloride is extensively used for anti-icing and de-icing and as a preservative. what is the meaning of the second icing method you just mentioned? De-icing is the process of removing snow, ice or frost from a surface. where is it commonly used? Trains, rail switches, aircraft, etc. how is the afore mentioned element used in the transfer of heat? Liquid sodium is used as a heat transfer fluid in some types of nuclear reactors. what role does it play in human biology? In humans, sodium is an essential mineral that regulates blood volume, blood pressure, osmotic equilibrium and pH. how you explain the last term you just mentioned? In chemistry, pH is a scale used to specify the acidity or basicity of an aqueous solution. how are its ranges classified in soil? In Europe, topsoil pH is influenced by soil parent material, erosional effects, climate and vegetation.
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PH [SEP] History
The concept of pH was first introduced by the Danish chemist Søren Peder Lauritz Sørensen at the Carlsberg Laboratory in 1909 and revised to the modern pH in 1924 to accommodate definitions and measurements in terms of electrochemical cells. In the first papers, the notation had the "H" as a subscript to the lowercase "p", as so: p. The exact meaning of the "p" in "pH" is disputed, as Sørensen did not explain why he used it. He describes a way of measuring it using "potential" differences, and it represents the negative "power" of 10 in the concentration of hydrogen ions.