13. What will happen to the equilibrium (shown below) for a 0.1 M solution of NH3 if a small amount of hydrochloric acid (HCI) is added to the solution? NH3 + H2O +→ NH4* + OH a. The reaction will shift to the left and more NH3 will form b. The reaction will shift to the right and more NH4* will form C. The addition of HCl will not affect the equilibrium of the reaction

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Chapter1: Chemical Foundations
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nen ammonium chloride (NH.CI) is dissolved in water, will the resulting pH be greater than 7, less than 7, or equal to 7.
The ammonium ion (NH4*) is the conjugate acid of the weak base: ammonia (NH3).
a. pH <7
b. pH > 7
C. neutral
13. What wilI happen to the equilibrium (shown below) for a 0.1 M solution of NH3 if a small amount of hydrochloric acid (HCI) is
added to the solution?
NH3 + H20 +→ NH+* +
OH
a. The reaction will shift to the left and more NH3 will form
b. The reaction will shift to the right and more NH4* will form
c. The addition of HCl will not affect the equilibrium of the reaction
14. When mixed in appropriate amounts, each of the following mixtures can produce an effective buffer solution except
a. H2PO4 and NaH2PO4
b. NazHPO4 and Na3PO4
C. NaHCO3 and NazCO3
d. NaOH and NH3
15. A pH = 9.3 buffer solution is made with the concentration of ammonia (NH3) = 1.0M and the concentration of ammonium ion
%3D
(NH.") = 1.0 M. What is the approximate final pH after 0.2 mole of NaOH is added? Hint: no calculations are needed here
because the question is asking for the "approximate" pH.
%3D
a. pH < 9.3
b. pH = 9.3
Transcribed Image Text:nen ammonium chloride (NH.CI) is dissolved in water, will the resulting pH be greater than 7, less than 7, or equal to 7. The ammonium ion (NH4*) is the conjugate acid of the weak base: ammonia (NH3). a. pH <7 b. pH > 7 C. neutral 13. What wilI happen to the equilibrium (shown below) for a 0.1 M solution of NH3 if a small amount of hydrochloric acid (HCI) is added to the solution? NH3 + H20 +→ NH+* + OH a. The reaction will shift to the left and more NH3 will form b. The reaction will shift to the right and more NH4* will form c. The addition of HCl will not affect the equilibrium of the reaction 14. When mixed in appropriate amounts, each of the following mixtures can produce an effective buffer solution except a. H2PO4 and NaH2PO4 b. NazHPO4 and Na3PO4 C. NaHCO3 and NazCO3 d. NaOH and NH3 15. A pH = 9.3 buffer solution is made with the concentration of ammonia (NH3) = 1.0M and the concentration of ammonium ion %3D (NH.") = 1.0 M. What is the approximate final pH after 0.2 mole of NaOH is added? Hint: no calculations are needed here because the question is asking for the "approximate" pH. %3D a. pH < 9.3 b. pH = 9.3
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