First row question

Moderators: Chem_Mod, Chem_Admin

chloewinnett1L
Posts: 55
Joined: Fri Sep 28, 2018 12:20 am

First row question

Postby chloewinnett1L » Fri Jan 25, 2019 12:52 am

What is the molecular reasoning for why the presence of row 1 elements in acids do not affect the pH? I understand that they don't have to be accounted for when calculating, for example, the pH of a solution of nitrous acid and potassium nitrite, but why is that? Just curious.

Elaine Pham 2E
Posts: 58
Joined: Fri Sep 28, 2018 12:28 am
Been upvoted: 1 time

Re: First row question

Postby Elaine Pham 2E » Fri Jan 25, 2019 12:34 pm

These cations from group 1 and 2 are very weak Lewis acids, and they're so weak to the point that they don't have an effect on the water molecules around them. Therefore, you don't account for them when calculating pH.

Tessa Lawler 1A
Posts: 57
Joined: Fri Sep 28, 2018 12:18 am

Re: First row question

Postby Tessa Lawler 1A » Sun Jan 27, 2019 10:00 pm

They don't have a large enough impact on the pH to significantly change your answer, whether you include them in the calculations or not.

Luis_Yepez_1F
Posts: 50
Joined: Fri Sep 28, 2018 12:18 am

Re: First row question

Postby Luis_Yepez_1F » Sun Jan 27, 2019 10:15 pm

Cations from groups 1 and 2 or cations with just a +1 charge are not large enough to have enough of an effect.


Return to “Equilibrium Constants & Calculating Concentrations”

Who is online

Users browsing this forum: No registered users and 1 guest