What is the final pH of a solution formed by mixing equal volumes of two separate solutions of pH 2.0 and 4.0?

 

How can we approach the question?

 
pH refers to the power of hydrogen.

Hint #1: It is not 3.0!

Hint #2: The concept involved is ionic equilibrium.

Hint #3: Find the total concentration of hydrogen ions before applying the formula pH = – lg [H+]

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