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# What is the pH of 0.01 M solution of HCl?(a) 1(b) 10(c) 5(d) 2

Last updated date: 23rd Apr 2024
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Hint: pH is a scale which is used to determine the acidity or basicity of a compound. It is expressed as a negative log of proton concentration. A higher value of pH more than 7 indicates basic solution while a lower value of pH less than 7 indicates solution is acidic.

Let us see the dissociation of HCl in an aqueous solution.
${{H}^{+}}+C{{l}^{-}}\to HCl$
$H\to {{H}^{+}}+{{e}^{-}}$
$Cl+{{e}^{-}}\to C{{l}^{-}}$
HCl dissociates as proton (${{H}^{+}}$) and chloride anion ($C{{l}^{-}}$) in an aqueous solution.
From the above reaction (i), we can see that 1 mole of ${{H}^{+}}$reacts with 1 mole of $C{{l}^{-}}$to give 1 mole of Hydrochloric acid – HCl.
Therefore, 0.01 M solution of HCl will produce 0.01 M of ${{H}^{+}}$.
pH is defined as the negative log of the hydrogen ion concentration. Mathematically, it is expressed as –
pH = - log [${{H}^{+}}$]
Putting the value of hydrogen ion concentration, we get –
pH = - log [0.01]
pH = - log (${{10}^{-2}}$)
pH = 2 log 10
Since, log 10 = 1,
Therefore, pH = 2
Hence, the answer is – option (d) – the pH of 0.01 M solution of HCl is 2.