Midterm 3D

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Ellen Amico 2L
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Joined: Thu Sep 19, 2019 12:16 am

Midterm 3D

Postby Ellen Amico 2L » Sat Feb 22, 2020 1:13 pm

Why is the net charge -1 for acetic acid? Could someone explain the reasoning behind the answer?

Deepika Reddy 1A
Posts: 125
Joined: Thu Jul 11, 2019 12:15 am

Re: Midterm 3D

Postby Deepika Reddy 1A » Sat Feb 22, 2020 1:25 pm

The first thing I did was I wrote out the reaction that would take place for the acid CH3COOH. When this is added to water, you end up with H30+ and CH3COO- in the products. Since the solution is at pH=6 which is slightly acidic, we know that there are more products in the solution because H3O+ is on the products side. Therefore, the net charge would be -1 because CH3COO- is present in a larger concentration in the solution.

Callum Guo 1H
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Joined: Fri Aug 02, 2019 12:15 am
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Re: Midterm 3D

Postby Callum Guo 1H » Sat Feb 22, 2020 10:44 pm

at ph 6 there is more products than reactants so it would be more negative

Ariel Fern 2B
Posts: 105
Joined: Fri Aug 30, 2019 12:17 am

Re: Midterm 3D

Postby Ariel Fern 2B » Sun Feb 23, 2020 9:00 am

Since the pKa of acetic acid (4.75) is lower than the pH of the specified condition (6), the acetic acid will be able to dissociate into CH3COO-, which has a negative one charge. Hope this helps!!

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