Respuesta :
The pH at Equivilance point is 5.363
The total form of pH is potential of Hydrogen. pH is known as the poor logarithm of H+ ion concentration. for this reason the which means of the name pH is defined because the power of hydrogen. pH describes the attention of the hydrogen ions in a solution and it is the indicator of acidity or basicity.
Kb for (CH₃)₃N = 5.33 * 10⁻⁵
Since concentration of HCL = (CH₃)₃N
= 0.2
For reaching equillibirium point we need to add 100 ml HCL
(CH₃)₃N + HCl ==========> (CH₃)₃NH⁺ + Cl⁻
mole (CH₃)₃N = molarity * vol(in L) = 0.2 *0.1 = 0.02
⇒ mole of (CH₃)₃NH⁺ + formed = 0.02
total volume = 100+ 100 = 200ml = 0.2 L
molarity of (CH₃)₃NH = 0.02/0.2 = 0.1 M
(CH₃)₃NH⁺ -------------> (CH₃)₃N + H⁺
initial 0.1 0 0
at eq 0.1 - x x x
Now, Kb = Kw/Ka = 10^ -14/5.33b*10^5
⇒Kb = 1.876b* 10 ^-10
Kb = X^2/0.-x => 0.1 * 1.876 *10^-10
X = [H+] = 4.33 *10⁻⁶
pH = - log [H+] = 5.363
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