how do we calculate pH value of a substance?
Asked by | 1st Jun, 2008, 09:20: PM
pH is a measure of the activity of dissolved hydrogen ions (H+),The formula for calculating pH is: Where αH+ denotes the activity(concentration) of H+ ions, and is dimensionless. Example:Dissolving the strong acid HCl in water can be expressed as: HCl(aq) → H+ + Cl−This means that in a 0.01 mol/L solution of HCl it is approximated that there is a concentration of 0.01 mol/L dissolved hydrogen ions. From above, the pH is: pH = −log10 [H+]: pH = −log (0.01) which equals 2.
Aswered by | 16th Jun, 2008, 12:34: AM
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