# Chem 122 16-17

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1. Keq is the?
The formula:
3H2 + N2⇌2NH3
It is written?
• equilibrium constant
2. The equilibrium constant shows
• -the if there is more reactant than product at equilibrium.
• -the extent to which the forward and reverse reaction take place.
3. How is Ionization constant symbolized?
Kw, Ka, etc.
4. Set up the solution for this problem:

At 25oC, a 0.100 M solution of HC2H3O2
is 1.34% ionized and has an [H+]
of 1.34 x 10-3 mol/L.  Calculate Ka for acetic acid.

HC2H3O2⇌H+C2H3O2
• HC2H3O2=.1-.00134=0.099mol/L reactant
•  HC2H3O2 yields 1 mole of both, so equal moles of each=1.34 x 10-3 mol/L, HC2H3O2
• =1.8X10^-5
5. Ionic Equilibria problems measure...
the pH from the ionization constant Ka
6. what's the solubility product constant
Ksp
7. 5 steps for writing the Sparingly soluble solids
• Ksp:
• 1) ionize the salt
• 2) write the Ksp expression
• 3) determine the moles of the ions
• 4) substitute into the Ksp expression
• 5) Ksp has no denominator
8. The solubility of AgCl in water is 1.3 x 10^-5 mol/L.
AgCl(s)⇌Ag+(aq) + Cl-(aq)
Set up this solution
[Ag]=[Cl]=is 1.3 x 10^-5, so

(1.3 x 10^-5 )(1.3 x 10^-5 )=1.7X10^-10
9. Write the Ksp expression for PbSO4
Then, substitute x.
• PbSO4⇌Pb^2+SO4^-2
• Expression Ksp=[Pb+2][SO4-2]
• Substitute x: Ksp=[X][X]
10. What is hydrolysis?
term used for general reactions which a water molecule is split
11. how do you buffer a solution?

what do I need to know about them?
• -a weak acid mixes with it's conjugate base form a buffer solution
• -they resist pH changes with small dilutions
12. the oxidation number represents
# of e- lost, gained, & unequally shared.

-Lost/gained=metal & non-metal. (ionic bond)

-unequally shared=2 mor more non-metals. (covalent)
13. what does a positive & negative oxidation # mean?
• +=fewer electrons
• -=more electrons
14. All elements in their free state (Na, Cu, Mg, H2, O2, Cl2, N2) have an oxidization number of
zero.
15. H is +1, except in ______, where it is___ (eg NaH, CaH)
metal hydrides, -1
16. O s -2, except in ____, where it is ___, and OF2, where it is ___
peroxides, -1, +2.
17. The metallic elements in ionic compounds has a ____ oxidation number
positive
18. In covalent compounds, the ____ oxidation number is assigned to the most ____
negative, electronegative
19. The algebraic sum of the oxidation numbers of the elements in a compound is
0
20. The algebraic sum of the oxidation number of the elements in a polyatomic ion is ____ the charge of the ion
equal to
21. Determine the oxidation number for manganese on potassium permanganate (polyatomic ion)?
KMnO4
• K=+1(1)=1
• O=-2(4)=-8
• 1+-8+X=0, so Mn=7
 Author: studysuccess ID: 303438 Card Set: Chem 122 16-17 Updated: 2015-06-01 20:46:00 Tags: Chem 122 16 17 Folders: Chem 122 16-17 Description: Chem 122 16-17 Show Answers: