Test 1

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Dustin Shin 2I
Posts: 64
Joined: Fri Sep 28, 2018 12:26 am

Test 1

Postby Dustin Shin 2I » Thu Jan 24, 2019 1:27 am

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.

Ava Kjos 1D
Posts: 65
Joined: Fri Sep 28, 2018 12:19 am

Re: Test 1

Postby Ava Kjos 1D » Thu Jan 24, 2019 9:23 am

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.

Charles Gu 1D
Posts: 60
Joined: Fri Sep 28, 2018 12:16 am

Re: Test 1

Postby Charles Gu 1D » Thu Jan 24, 2019 6:39 pm

The quadratic formula will also be given.

Douglas Nguyen 2J
Posts: 71
Joined: Fri Sep 28, 2018 12:15 am

Re: Test 1

Postby Douglas Nguyen 2J » Thu Jan 24, 2019 8:01 pm

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

MadisonB
Posts: 63
Joined: Fri Sep 28, 2018 12:19 am

Re: Test 1

Postby MadisonB » Thu Jan 24, 2019 8:41 pm

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.

Mya Majewski 1L
Posts: 89
Joined: Fri Sep 25, 2015 3:00 am

Re: Test 1

Postby Mya Majewski 1L » Thu Jan 24, 2019 11:27 pm

to correct the equation above pOH +pH=14 NOT pkw

Andre_Galenchik_2L
Posts: 69
Joined: Fri Sep 28, 2018 12:23 am

Re: Test 1

Postby Andre_Galenchik_2L » Fri Jan 25, 2019 12:03 am

If pOH and pH always add up to 14, is it possible to have a negative pH? What about a pH higher than 14?

Aili Ye 4L
Posts: 58
Joined: Fri Sep 28, 2018 12:16 am

Re: Test 1

Postby Aili Ye 4L » Fri Jan 25, 2019 11:33 am

pKw at 25 degrees IS 14.

Elle_Mendelson_2K
Posts: 72
Joined: Fri Sep 28, 2018 12:28 am

Re: Test 1

Postby Elle_Mendelson_2K » Fri Jan 25, 2019 11:42 am

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.

Lopez_Melissa-Dis4E
Posts: 66
Joined: Fri Sep 28, 2018 12:20 am

Re: Test 1

Postby Lopez_Melissa-Dis4E » Fri Jan 25, 2019 1:25 pm

You should assume that most equations will be given on the constant/equation sheet.


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