pH of Hydronium Ion

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Layal Suboh 1I
Posts: 61
Joined: Fri Sep 28, 2018 12:23 am

pH of Hydronium Ion

Postby Layal Suboh 1I » Wed Jan 16, 2019 5:14 pm

In class today, Dr. Lavelle said that if the concentration of hydronium ion is less than 10^-7, then the solution is considered neutral. I understand that it is because the pH would be greater than 7, which is considered basic, but why exactly would the concentration of hydronium ion in a solution result in a pH that's basic?

Emmaraf 1K
Posts: 94
Joined: Sat Oct 20, 2018 12:16 am

Re: pH of Hydronium Ion

Postby Emmaraf 1K » Wed Jan 16, 2019 5:41 pm

Basically what was meant in lecture is that when you get the hydronium ion concentration is less than 10^-7, this value is really representing the change in hydronium ion concentration (think "x" in the ICE table) from the initial hydronium ion concentration, which was 10^-7. Therefore, since the "x" value you calculated is so small in comparison to the initial hydronium ion concentration of 10^-7, the value is negligible so you just say the concentration remained at 10^-7 so the pH is 7 still.

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