Test #1

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KeiannaPineda1B
Posts: 51
Joined: Mon Jun 17, 2019 7:24 am

Test #1

Postby KeiannaPineda1B » Tue Jan 21, 2020 6:24 pm

Will there be the 5% rule o (or 10^3 rule) on the chem test?

Joseph Saba
Posts: 154
Joined: Thu Jul 11, 2019 12:16 am

Re: Test #1

Postby Joseph Saba » Tue Jan 21, 2020 6:42 pm

Probably, keep it in mind while doing calculations. Look for the Ka/b value that is lower then 10^-3. If you are unsure you can always calculate it and see that the x is insignificant at the end.

Prasanna Padmanabham 4I
Posts: 111
Joined: Thu Jul 25, 2019 12:17 am

Re: Test #1

Postby Prasanna Padmanabham 4I » Tue Jan 21, 2020 7:56 pm

Well, if Ka is less than 10^-3, then you are usually safe to approximate. In the end, though, you typically need to make sure that x is less than 5% of the initial concentration. If it is less than 5%, you are good, if it's not, you need to redo the problem.

For the test specifically, I'm not sure if you need to show your work explicitly or if you could just glance at it and move on if you are good...


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