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pH = -log[H+]

That is, the pH of a solution is the negative log of the concentration of hydrogen atoms. The concentration of hydrogen atoms must be in units of Molarity, or moles per liter. In order to determine the pH of a solution containing 1 mole of HCl, you must also know the volume of the solution.

I am assuming the question is: What is the pH of 1M HCl, and not 1 mole. 1 mole HCl is simply the mass in grams of the atomic weight of H and Cl: 1+35.45=36.45. This is not a unit of concentration and if that is truly the question then the answer is undefined.

Molarity on the other hand, and other units of concentration, are completely independent of total amount of solution (volume or mass): molarity (M)= moles/Liters

HCl is a strong acid. This means that all of those acid hydrogens are releasing into solution and therefore the calculation is very simple:

pH of strong acid= -log[H+] 1M HCl= 1M[H+] + 1M[Cl-] pH=-log[1]= 0

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What has the pH of 1?

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