The test from last year.
To give you an idea of the types of questions I might ask.
Name (5) ________________
1008-261 (20011)
Please answer each of the following questions on this 2-page exam.
Test 2
1a)
For the Reaction 3A(g) + 2B(l) + C(s) = 2D(aq) + E(aq) the concentrations at equilibrium are
found to be A: 780 torr, B: 24.2 M, C: 18.0 M D: 1.4 x 10 -2 M E: 3.6 x 10-4 M. What is the value of
the equilibrium constant? 1 Atm = 760 torr (10)
b)
What is the equilibrium constant for the reverse reaction? (5)
c)
If additional B is added to the reaction mixture what will happen to the concentration of D?
(Increase, decrease or stay the same). (5)
d)
If additional E is added to the reaction mixture to initial increase its concentration of E to
3.6 x 10-4 M then what will happen to the concentration of A? (Increase, decrease or stay the
same). (5)
e)
With this added amount of E what will be the value of the equilibrium constant. (5)
2)
What would be the concentration (in moles per liter) of silver ion in a solution that is saturated
by adding excess Ag2S(s). The Ksp of Ag2S is 8 x 10-51? (10)
What is pAg? (5)
3)
How many grams of BaSO4 would dissolve in 100.0 mL of a solution that is 0.0100 M
NaSO4. Ksp of BaSO4 is 1.1 x 10-10. FW of BaSO4 (233.40 g/mol) and FW of Na2SO4
(142.04 g/mol). (15)
4)
An acid/base titration is carried out. 10.0 mL of H 2SO4 solution is added to 90.0 mL of water
and titrated to phenolphthalein endpoint with 23.42 mL of 0.1007 M NaOH. What is the
concentration of the initial sulfuric acid solution(moles/liter). (15)
5)
What is the difference between an equivalence point and an end point in a titration? (5)
6)
What is a Lewis acid? (5)
7)
What is a Bronsted-Lowry acid? (5)
Recall that there have two chapters worth of online multiple choice to go over.
Also we talked about calibration and there might we some questions on that topic for this test.