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- 1. Multiple ChoiceWhen the chemical reaction A + B ↔ C+ D is at equilibrium,both the forward and reverse reactions have stopped.the sum of the concentrations of A and B equals the sum of the concentrations of C and D.all four concentrations are equal.neither the forward nor the reverse reactions have stopped.
- 2. Multiple ChoiceA substance that ionizes completely in solution isan insulator.a strong electrolyte.a weak acid.a non-electrolyte.
- 3. Multiple Choice
Which is the weakest acid?HFHNO2CH3COOHHClO - 4. Multiple ChoiceConsider the general equation for an acid in water:
HA(aq) + H2O ↔ H3O+ + A-
If there is a lot of product, what does that tell you about the acid?Ka > 1 Strong acidKa > 1 Weak acidKa < 1 Strong acidKa < 1 Weak acid - 5. Multiple ChoiceWhich of the following is a conjugate acid/base pair?HCl/OCl-H2SO4/SO42-NH4+/NH3H3O+/OH-
- 6. Multiple ChoiceThe pH of a solution at 25ₒC in which [OH-] = 3.9 x 10-5M is:4.413.909.594.80
- 7. Multiple ChoiceCalculate the pH of a 0.47M NH3 (Kb = 1.8 x 10-5) solution.2.548.935.0711.46
- 8. Multiple ChoiceCalculate the [H+] in a solution that has a pH of 2.73.5.4 x 10-12 M1.9 x 10-3 M2.7 M11.3 M
- 9. Multiple ChoiceThe pH at the equivalence point of the titration of a strong acid with a strong base is:3.94.57.08.2
- 10. Multiple ChoiceWhich of the following is not a strong acid?nitricsulfuricperchlorichydrofluoric
- 11. Multiple ChoiceWhich of the following is NOT a Bronsted acid?OH-1H3O+1HNO3CH3COOH
- 12. Multiple ChoiceWhich of the following is the conjugate acid of HCO3-1?H2CO3CO3-2H2CO3-1CO3-1
- 13. Multiple ChoiceA double arrow in a chemical formula represents________________No reaction is occurring.The reaction is reversible.The reaction is only proceeding in forward.The reaction is only proceeding in the reverse direction.
- 14. Multiple Choice
The following statement is true for arrhenius acid and base EXCEPT
Arrhenius acid produces H+ ions
Arrhenius base produces OH- ions
H2O need to be present for Arrhenius acid base to dissociate
Hydrogen atoms make the solution acidic
- 15. Multiple Choice
Which of the following shows the correct conjugate acid base pair?
CH3COOH (acid) / H2O (conjugate base)
CH3COOH (acid) / CH3COO- (conjugate base)
H2O (base) / H+(conjugate acid)
H2O (base) / CH3COOH (conjugate acid)
- 16. Multiple Choice
The Ka, acid dissociation constant, for an acid is 9 x 10-4 at room temperature. At this temperature, what is the approximate percent dissociation of the acid in a 1.0 M solution?
0.03%
0.09%
3%
5%
9%
- 17. Multiple Choice
Phenol, C6H5OH, has a Ka =1.0 x 10-10. What is the pH of a 0.010 M solution of phenol?
between 3-7
10
2
between 7-10
7
- 18. Multiple Choice
When sodium nitrate is dissolved in water
the solution is acidic because of the hydrolysis of the sodium ion
the solution is neutral
The solution is basic because of hydrolysis of the sodium ion
The solution is acidic because of hydrolysis of the NO2- ion
- 19. Multiple ChoiceIf 72.1 mL of 0.543 M H2SO4 titrates completely with 39.0 mL of KOH, what is the molarity of the KOH solution?2.01 M1.00 M0.291 M0.502 M
- 20. Multiple Choice
What mass of sodium cyanide must be added to 250. mL of water in order to obtain a solution having a pH of 10.50? [Ka(HCN) = 4.9 x 10–10]
240 g
0.032 g
0.059 g
0.94 g
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