Analytical question...my professor is having a comprehensive exam tomorrow. I ju

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Analytical question...my professor is having a comprehensive exam tomorrow. I just had an exam Monday. It was on pH, pKa values, Ksp, activities, molar conc, molar solubilities, solution/dilution how much this, how much that etc. you probably know what I'm referencing to.
Question is what will I expect for a comprehensive exam if I just had a exam. How will it be laid out? Types or questions?
Any pointers or info to help me with it? I've never had a straight comprehensive exam. I guess they've always been bundled into my regular exams.
Please help with as much info on that as possible. Thanks! Analytical question...my professor is having a comprehensive exam tomorrow. I just had an exam Monday. It was on pH, pKa values, Ksp, activities, molar conc, molar solubilities, solution/dilution how much this, how much that etc. you probably know what I'm referencing to.
Question is what will I expect for a comprehensive exam if I just had a exam. How will it be laid out? Types or questions?
Any pointers or info to help me with it? I've never had a straight comprehensive exam. I guess they've always been bundled into my regular exams.
Please help with as much info on that as possible. Thanks!
Question is what will I expect for a comprehensive exam if I just had a exam. How will it be laid out? Types or questions?
Any pointers or info to help me with it? I've never had a straight comprehensive exam. I guess they've always been bundled into my regular exams.
Please help with as much info on that as possible. Thanks!

Explanation / Answer

Tips/questions expected:

pH --> definition of pH, theoretically know that pH = 14 ONLY at 25°C

pH value increases as T increases

Kw = [H+][OH-] = 10^-14 only at 25°C

note that

pKa + pKb = 14

He could trick you with pKa = 18, then pKb = ?

activities --> Add molecules such as glucose, which accountonly for i = 1

add moleucles such as NaAcetate, don't get tricked, this is a SALT, so Na+ and Acetate acount for i = 2

Mola concentrations --> convert from mass concentration (mass of solute / total mass) to molar concentration given density.. Simply assume a basis of 1 Liter for all solutions

For solution diution Law:

understand it is a molar banace

mol of A = mol of A

mol of A = M*V

so

M1*V1 = M2*V2 = same moles of A always!

For

Ksp --> Understand that you can compare solubilities directly IF:

AB <->A+ B+ since

Ksp = [A+][B-]

A2B <-> 2A+ + B-2

Ksp [A+]^2[B-2] --> you can't compare in both cases

but

if

AB <--> A+2 + B-2

Ksp = [A+2][B-2]

you can compare solublity

Understand for an acid that:

if Ka <<< 1

then

Ka = [x][x]/[M-X]

we can --> M-x --> since x is too small due to Ka value, then M-x = M

so

Ka = x^2/(M)

The most important is to understand the FUNDAMENTALS, don0t try to learn by hard all formulas!

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