Adding an Acid or Base in Water

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JesseAuLec1Dis1G
Posts: 52
Joined: Mon Jun 17, 2019 7:23 am

Adding an Acid or Base in Water

Postby JesseAuLec1Dis1G » Sun Jan 19, 2020 4:20 pm

If someone were to add 1.0x10^-9 mol of HCL to water than why is it that the pH of the water doesn't change that much? Lavelle talked about this in lecture but I'm not sure I fully understand.

SnehinRajkumar1L
Posts: 101
Joined: Thu Jul 11, 2019 12:15 am

Re: Adding an Acid or Base in Water

Postby SnehinRajkumar1L » Sun Jan 19, 2020 4:47 pm

It is such a small quantity of the acid that there is not enough to completely change its pH.

Sidharth D 1E
Posts: 98
Joined: Sat Aug 24, 2019 12:17 am

Re: Adding an Acid or Base in Water

Postby Sidharth D 1E » Thu Jan 23, 2020 1:16 pm

Due to the autoprotolysis of water, there is already a concentration of 1 x 10-7 M of [H3O+], so that amount of HCl would not have any impact.

Alex Tchekanov Dis 2k
Posts: 118
Joined: Sat Aug 24, 2019 12:16 am

Re: Adding an Acid or Base in Water

Postby Alex Tchekanov Dis 2k » Thu Jan 23, 2020 1:29 pm

In the example he gave in class, the value for the concentration of H3O+ would have been so low that it would be lower than the standard concentration in normal water. Therefore, since it logically doesn't make sense for acid to make the solution more basic, we just regard the addition of the molecules as negligible to the pH


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