What is the pH of a .001 M solution of HCl?
1 Answer
Explanation:
Hydrochloric acid,
This tells you that every mole of hydrochloric acid will dissociate to produce one mole of hydronium ions and one mole of chloride anions in aqueous solution.
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The balanced chemical equation looks like this
"HCl"_text((aq]) + "H"_2"O"_text((l]) -> "H"_3"O"_text((aq])^(+) + "Cl"_text((aq])^(-)
As you know, the pH of a solution is simply a measure of the concentration of hydronium ions.
color(blue)("pH" = - log(["H"_3"O"^(+)]))
So, if you get one mole of hydronium ions for every one mole of hydrochloric acid, you can say that
["H"_3"O"^(+)] = ["HCl"] = "0.001 M"
This means that the pH of the solution will be
"pH" = - log(0.001)
"pH" = color(green)(3)