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How to calculate pH of HCl in water?

What is the pH of HCl gas in water?

  • Is this a trick question or am I missing something? 10^-6 moles of HCl gas is bubbled into a 10^6 L of pure water. What is the pH? It looks simple: 10^-6 mol / 10^6 L = 10^-12 M and then pH = -log(10^-12) = 12 But if you're adding an acid into pure water (pH = 7), then shouldn't the resulting pH be less than 7? Thanks!

  • Answer:

    There are two contributors to the H+ concentration. The added HCl contributes a concentration of 10^-12 mol H+ per L. The water itself contributes 10^-7 mol H+ per L. Since the added H+ from the HCl is such a tiny fraction of that from the water, it can be neglected and you can say that the pH of the solution is still 7.00.

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There are two contributors to the H+ concentration. The added HCl contributes a concentration of 10^-12 mol H+ per L. The water itself contributes 10^-7 mol H+ per L. Since the added H+ from the HCl is such a tiny fraction of that from the water, it can be neglected and you can say that the pH of the solution is still 7.00.

ThinMan

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