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beccadrums
30.03.2021 •
Chemistry
Do you think surface tension affects the density column, and if so, how?
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Ответ:
[CH₃NH₃⁺] = 0.00355 M
[CH₃NH₂] = 0.028 M
pH = 11.55
Explanation:
The reaction is the following:
CH₃NH₂ + H₂O ⇄ CH₃NH₃⁺ + OH⁻ (1)
0.0317 - x x x
The equilibrium constant of the reaction (1) is:
By solving equation (2) for x, we have:
x₁ = -0.00399
x₂ = 0.00355
Taking the positive value, we have that:
x = [CH₃NH₃⁺] = [OH⁻] = 0.00355 M
[CH₃NH₂] = 0.0317 - x = (0.0317 - 0.00355)M = 0.028 M
Therefore, the concentrations of CH₃NH₂ and CH₃NH₃⁺ are 0.028 M and 0.00355 M, respectively.
The pH of the solution is:
Hence, the pH of the solution is 11.55.
I hope it helps you!