what is the pH of 10^-6 HCl (strong acid )?

Question

help plz!!!!!!

Answer 1

pH=1

Answer 2

The correct answer is actually 5.96, so 6 is the closest answer. When you have a concentration of acids or bases that are very close to or less than 10^-7, you have to take into consideration the fact that water has a concentration of 10^-7 for both hydronium and hydroxide. For the same reason that we often don't consider the mass of electrons (we just add the protons and neutrons) because they are so minute, we tend to ignore the ion concentration in water. This is the exception to taking the -log(conc.). Otherwise, if you were to add a highly diluted acid with a concentration of 10^-9 to pure water, the pH would actually go up... that doesn't make sense! Adding a small amount of acid to water makes it a base? That's why to answer this question, you would take the following: 1x10^-7 (concentration of H30+ for water) +1x10^-6 (concentration of HCl, which is the same as H30+ with all strong acids). = 1.1x10^-6. -log(1.1x10^-6) = 5.9586. As you can see, the pH isn't changed too drastically, and any acid stronger than that would only change the pH by a matter of a few thousandths or less.

Answer 3

pH=6. While very dilute, it totally ionizes, so [H+]=10^-6 mole/L

Answer 4

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