B. Determination of the hydrolysis constant (or acid dissociation constant, Ka) of NH4+.

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B. Determination of the hydrolysis constant (or acid dissociation constant,
Ka) of NH4+.
1. Consider a 0.01 M NH4CI solution.
2. Write the dissociation equation for NH4CI.
3. Identify the ion/s that can undergo hydrolysis.
4. It has been determined experimentally that the pH of 0.01 M NH4CI solution is
5.91. From the pH of the solution, solve for the concentration of all species
present in the solution. Input all your answers in Tables 2 and 3.
5. Solve for the Ka of NH4+.
6. Compare your experimental value to the literature value for the Ka of NH4+.
B. Determination of the hydrolysis constant (or acid dissociation constant,
Ka) of NH4*.
Table 2. Dissociation of NH,CI
Dissociation equation of NH4CI
pH of solution
lon that undergoes hydrolysis:
Hydrolysis reaction
Table 3. ICE Table for the Hydrolysis of NH4*
Parameter
[NH,*]
[H*]
[NH3]
Initial concentration
Change in
concentration
Equilibrium
Concentration
Solving for the hydrolysis constant, Kn (or Ka) of NH4+
Theoretical Value for Ka of NH4+
% Error:
Transcribed Image Text:B. Determination of the hydrolysis constant (or acid dissociation constant, Ka) of NH4+. 1. Consider a 0.01 M NH4CI solution. 2. Write the dissociation equation for NH4CI. 3. Identify the ion/s that can undergo hydrolysis. 4. It has been determined experimentally that the pH of 0.01 M NH4CI solution is 5.91. From the pH of the solution, solve for the concentration of all species present in the solution. Input all your answers in Tables 2 and 3. 5. Solve for the Ka of NH4+. 6. Compare your experimental value to the literature value for the Ka of NH4+. B. Determination of the hydrolysis constant (or acid dissociation constant, Ka) of NH4*. Table 2. Dissociation of NH,CI Dissociation equation of NH4CI pH of solution lon that undergoes hydrolysis: Hydrolysis reaction Table 3. ICE Table for the Hydrolysis of NH4* Parameter [NH,*] [H*] [NH3] Initial concentration Change in concentration Equilibrium Concentration Solving for the hydrolysis constant, Kn (or Ka) of NH4+ Theoretical Value for Ka of NH4+ % Error:
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