The increase in the concentration of H ions by 100 folds, decreases the pH by 2 units.
What is pH?
pH is the measure of the acidity or basicity of the aqueous solution or any given liquid which can be indicated by numbers ranging between 0-14. 7 is the neutral, anything below 7 is acidic and anything above 7 is taken as basic. It also is a measure of H ions in any given solution.
pH can be calculated as,
pH = -log [H+]
Ration of [H+], [H+2] / [H+1] =100
Change in pH, = pH2 - pH1 = -log [H+2] / [H+1] = -log [100] = -2
Therefore, pH decreases by 2 units, when the H ion concentration is increased by 100 folds. Here negative sign indicates the decrease in the pH.
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