### Test 1

Posted:

**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.

Created by Dr. Laurence Lavelle

https://lavelle.chem.ucla.edu/forum/

https://lavelle.chem.ucla.edu/forum/viewtopic.php?f=51&t=40620

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Posted: **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.

Posted: **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.

pOH + pH = pKw

[OH][H30] = Kw

(Ka)(Kb) = Kw

pKa + pKb = pKw

PV = nRT

If you know these then you should be good.

Posted: **Thu Jan 24, 2019 6:39 pm**

The quadratic formula will also be given.

Posted: **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

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

Posted: **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.

Posted: **Thu Jan 24, 2019 11:27 pm**

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

Posted: **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?

Posted: **Fri Jan 25, 2019 11:33 am**

pKw at 25 degrees IS 14.

Posted: **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.

Hope this helps.

Posted: **Fri Jan 25, 2019 1:25 pm**

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