If the work can be shown I would greatly appreciate it. Thank You 1. Calculate t
ID: 525541 • Letter: I
Question
If the work can be shown I would greatly appreciate it. Thank You
1. Calculate the concentration of a substance that has 10% light transmission and a molar absorptivity constant of 4500 M-1cm-1 (path length of cuvet is 1.0cm)
2. If Keq is large (Keq>>1), does equilibrium lie on reactants or products side?
3. 20.0mL of a calcium carbonate solution of unknown concentration was titrated with 25.0mL of 0.3M hydrochloric acid. What is the concentration of the calcium carbonate solution?
4. You titrated a solution of HCl with a 0.5M NaOH. What was the pH at the equivalence point?
5. Which one of the following is the weakest acid?
A) HF (Ka = 6.8 × 10-4)
B) HClO (Ka = 3.0 × 10-8)
C) HNO2 (Ka = 4.5 × 10-4)
D) HCN (Ka = 4.9 × 10-10)
E) Acetic acid (Ka = 1.8 × 10-5)
6. Calculate the Ka of an acid with a pKa of 3.14.
7. Use the titration curve below to find Ka, pKa of the acid. (use the half equivalence point)
8. Give the correct equilibrium constant expression (Kc) for the following reaction? CO2(aq) + H2O(l) H2CO3(aq)
10. Which compound listed below has the greatest molar solubility in water?
A) CdCO3
B) Cd(OH)2
C) AgI
D) CaF2
E) ZnCO3
11. The concentration of fluoride ions in a saturated solution of barium fluoride is __________ M. The solubility product constant of BaF2 is 1.7 × 10-6.
A) 3.8 × 10-4
B) 3.0 × 10-3
C) 1.5 × 10-2
D) 7.5 × 10-3
E) 1.4 × 10-4
12. The concentration of barium ions in a saturated solution of barium fluoride is __________ M. The solubility product constant of BaF2 is 1.7 × 10-6.
A) 3.8 × 10-4
B) 3.0 × 10-3
C) 1.5 × 10-2
D) 7.5 × 10-3
E) 1.4 × 10-4
13. The solubility of lead (II) chloride (PbCl2) is 1.6 × 10-2 M. What is the Ksp of PbCl2?
A) 5.0 × 10-4
B) 4.1 × 10-6
C) 3.1 × 10-7
D) 1.6 × 10-5
E) 1.6 × 10-2
14. What is the pH range of the equivalence point of a weak acid titrated with a strong base?
acidic neutral basic
15. What is the pH of at the equivalence point of a strong acid titrated with a strong base?
16. 10.5 mL of a monoprotic acid with an unknow concentration was titrated with a 0.100 M NaOH. If it took 19.9 mL of base to reach the endpoint what was the concentration of the acid?
17. Are the following salts acid, basic or neutral when dissolved in water?
a. NaCl sodium chloride
b. NH4Br ammonium bromide
c. KF potassium fluoride
d. NaCH3COOH sodium acetate
Explanation / Answer
1. Calculate the concentration of a substance that has 10% light transmission and a molar absorptivity constant of 4500 M-1cm-1 (path length of cuvet is 1.0cm)
A = 2-log(T%)
A = 2-log(10) = 1
now
A = e*L*M
1 = 4500*1*M
M = 1/4500
M = 0.00022222222 mol per liter