Calculate the pH of a solution containing a salt B Cl derived from a strong acid (HCl) and a weak Base (B OH), like NH4Cl, CH3NH3I, Ph-NH3Br and so on. In this case two processes have to be considered: 1. Dissociation of the salt, within the assumption that the salt is a strong electrolyte: B Cl → B + + Cl-, for instance: NH4Cl → NH4+ + Cl- 2. the hydrolysis of the water B + + H2O ⇌ B OH + H+, for example: NH4+ + H2O ⇌ NH4OH + H+ (often shown as NH4+ ⇌ NH3 + H+ ) knowing that the initial concentration of the salt is 1.67 M, and the base dissociation constant, Kb , is 8.43e-7.

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Calculate the pH of a solution containing a salt B Cl derived from a strong acid (HCl) and a weak

Base (B OH), like NH4Cl, CH3NH3I, Ph-NH3Br and so on. In this case two processes have to be considered:

1. Dissociation of the salt, within the assumption that the salt is a strong electrolyte:

     B Cl → B + + Cl-,   for instance: NH4Cl → NH4+ + Cl-

2. the hydrolysis of the water

     + + H2O ⇌ B OH + H+,    for example: NH4+ + H2O ⇌ NH4OH + H+   (often shown as NH4+ ⇌ NH3 + H+ )

knowing that the initial concentration of the salt is 1.67 M,

and the base dissociation constant, Kb , is 8.43e-7.

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