CHEMISTRY 111 EXAM QUESTIONS AND ANSWERS BEST EXAM SOLUTION LATEST UPDATE 2021/2022 GRADED A+ ASSURED SATISFACTION

CHEMISTRY 111 EXAM QUESTIONS AND ANSWERS BEST EXAM
SOLUTION LATEST UPDATE 2021/2022 GRADED A+ ASSURED
SATISFACTION
WS #1 Conjugate Acid-Base Pairs



 Make some brief notes on the commercial base NaOH - five common uses.
Describe the difference between a concentrated and dilute acid (hint: concentration refers to
the molarity). Describe their relative conductivities.
Concentrated means relatively high molarity and dilute means relatively low molarity.
 Describe the difference between a strong and weak acid (p 121-124). Use two examples and
write equations to support your answer. Describe their relative conductivities.
A strong acid completely ionizes and a weak acid partially ionizes.


 Describe a situation where a strong acid would have the same conductivity as a
weak acid (hint: think about concentration).
A weak acid could have a high molarity and the strong acid could have a low molarity.


Complete this worksheet for next period. Read pages 107-126 for homework.


Complete each acid reaction. Label each reactant or product as an acid or base. The first on is
done for you.
1. HCN + H2O ⇄ H3O+ + CN-
Acid Base Acid Base


2. H3C6O7 + H2O ⇄ H2C6O7- + H3O+
acid base base acid
CHEMISTRY 111 EXAM QUESTIONS AND ANSWERS BEST EXAM
SOLUTION LATEST UPDATE 2021/2022 ASSURED SATISFACTION
GRADED A+

,CHEMISTRY 111 EXAM QUESTIONS AND ANSWERS BEST EXAM
SOLUTION LATEST UPDATE 2021/2022 GRADED A+ ASSURED
SATISFACTION

3. H3PO4 + H2O ⇄ H2PO4- + H3O+
acid base base acid


HF + H2O ⇄ F- + H3O+
acid base base acid


H2CO3 + H2O ⇄ HCO3- + H3O+
acid base base acid


6. NH4+ + H2O ⇄ NH3 + H3O+
acid base base acid


7. CH3COOH + H2O ⇄ CH3COO- +
H3O+ acid base base
acid
8. HCl + H2O → Cl- + H3 O
+


acid base base acid


9. HNO3 + H2O → H3O+ + NO3 -
acid base acid
base



CHEMISTRY 111 EXAM QUESTIONS AND ANSWERS BEST EXAM
SOLUTION LATEST UPDATE 2021/2022 ASSURED SATISFACTION
GRADED A+

,CHEMISTRY 111 EXAM QUESTIONS AND ANSWERS BEST EXAM
SOLUTION LATEST UPDATE 2021/2022 GRADED A+ ASSURED
SATISFACTION
Write the equilibrium expression (Ka) for the first seven above reactions.


10. Ka = [H3O+] [ CN-] 14. Ka = [H3O+] 3



[HCO -]
[HCN
] [H2CO3]


11. Ka = [H3O+] [H2C7 6O -] 15. Ka = [H3O+]
[NH3]
[H3C6
O7
] [NH4 +]


12. Ka = [H3O+] [H2PO
4
-
] 16. Ka = [H3O+]
[CH3C
OO-]
[H3PO4
] [CH3COOH]


13. Ka = [H3O+] [F-]
[HF]
17. Which acids are strong? The six on the top of the acid chart are strong.
18. What does the term strong acid mean? They complete ionization into ions. Such as: HCl +

CHEMISTRY 111 EXAM QUESTIONS AND ANSWERS BEST EXAM
SOLUTION LATEST UPDATE 2021/2022 ASSURED SATISFACTION
GRADED A+

, CHEMISTRY 111 EXAM QUESTIONS AND ANSWERS BEST EXAM
SOLUTION LATEST UPDATE 2021/2022 GRADED A+ ASSURED
SATISFACTION
H2O → Cl- + H3O+


19. Why is it impossible to write an equilibrium expression for a strong acid? Ka =
[H3O+] [Cl-] [HCl]
is equal to zero and in math numbers divided by zero are
undefined. [HCl]
20. Which acids are weak?
All acids listed on the acid chart below the top six.
23. What does the term weak acid mean?
Incomplete ionization. Such as: HF + H2O ⇄ F- + H3O+
24. Explain the difference between a strong and weak acid in terms of electrical conductivity.
A strong acid is a good conductor. A weak acid conducts but not so good.
Acid Conjugate Base Base Conjugate Acid


14. HNO2 NO2 - 15. HCOO- HCOOH

16. HSO3 - SO3 2- 17. IO3 - HIO3

18. H2O2 HO2 - 19. NH3 NH4 +

20. HS- S2- 21. CH3COO- CH3COOH
22. H2O OH- 23. H2O H3O+


Define:
22. Bronsted acid- a proton donor


CHEMISTRY 111 EXAM QUESTIONS AND ANSWERS BEST EXAM
SOLUTION LATEST UPDATE 2021/2022 ASSURED SATISFACTION
GRADED A+