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Test 1

Posted: Thu Jan 24, 2019 1:27 am
by Dustin Shin 2I
For the first test, are there things we should know going into the test that is not given to us? This can range from different formulas to conversions or anything else.

Re: Test 1

Posted: Thu Jan 24, 2019 9:23 am
by Ava Kjos 1D
Pretty much all of the formulas and conversions are given. You should know the following relationships:

pOH + pH = pKw
[OH][H30] = Kw
(Ka)(Kb) = Kw
pKa + pKb = pKw
PV = nRT

If you know these then you should be good.

Re: Test 1

Posted: Thu Jan 24, 2019 6:39 pm
by Charles Gu 1D
The quadratic formula will also be given.

Re: Test 1

Posted: Thu Jan 24, 2019 8:01 pm
by Douglas Nguyen 2J
You can consult the Constants and Equations sheet on Dr. Lavelle's website too! It's pretty handy to use while you do your homework so that you're used to it when taking tests:

https://lavelle.chem.ucla.edu/wp-conten ... ations.pdf

Re: Test 1

Posted: Thu Jan 24, 2019 8:41 pm
by MadisonB
They usually provide all the equations you need to know. I find it best to look at it before the test so you are familiar where everything is.

Re: Test 1

Posted: Thu Jan 24, 2019 11:27 pm
by Mya Majewski 1L
to correct the equation above pOH +pH=14 NOT pkw

Re: Test 1

Posted: Fri Jan 25, 2019 12:03 am
by Andre_Galenchik_2L
If pOH and pH always add up to 14, is it possible to have a negative pH? What about a pH higher than 14?

Re: Test 1

Posted: Fri Jan 25, 2019 11:33 am
by Aili Ye 4L
pKw at 25 degrees IS 14.

Re: Test 1

Posted: Fri Jan 25, 2019 11:42 am
by Elle_Mendelson_2K
While it is possible to have a negative pH or a pH that is above 14, for the purpose of this class, we are only considering phs of 0-14.
Hope this helps.

Re: Test 1

Posted: Fri Jan 25, 2019 1:25 pm
by Lopez_Melissa-Dis4E
You should assume that most equations will be given on the constant/equation sheet.