Respuesta :
Solubility is the ability of the solute to form a complex with solvent to produce a solution. 12.30 is the pH of the saturated solution of triethylamine.
What is pH?
The pH of the solution is the hydrogen or the hydronium ion potential dissolved in the water.
Given,
Solubility of triethylamine = 68.6gL
Molar mass = 101.19 gm/mol
NAse ionization constant = 6. 0×10−4
The concentration of the solution will be:
68.6gL ÷ 101.19 gmol = 0.678M
The equation for the base ionization is shown as:
B+ H₂O ⇄ BH⁺ + OH⁻
Here, base (B) and conjugate acid (BH⁺). If the initial concentration of base decreases as −x and the concentration of BH⁺ and OH⁻ increase by x then,
The final concentrations are:
[B] =0.678−x,
[BH⁺] =x
[OH⁻] =x
The base ionization constant:
Kb = [BH⁺][OH⁻] / [B]
6.0×10⁻⁴ = x² 0.678
Solving further for x:
x = √(6.0×10⁻⁴)(0.678)
= 2.02×10⁻² M
The pOH is calculated as:
pOH = −log [OH⁻]
= − log(2.02×10⁻²)
= 1.70
Solving for the pH:
pH = pKw − pOH
pH = 14.00 − 1.70
= 12.30
Therefore, 12.30 is the pH of the saturated solution of triethylamine in water.
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