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YaboiLawLess709
02.08.2019 •
Chemistry
When do th macroscopic properties become constant in an equilibrium system?
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Ответ:
Ответ:
Explanation:
To calculate pH you need to use Henderson-Hasselbalch formula:
pH = pka + log₁₀![\frac{[A^-]}{[HA]}](/tpl/images/0269/9419/1d212.png)
Where HA is the acid concentration and A⁻ is the conjugate base concentration.
The equilibrium of acetic acid is:
CH₃COOH ⇄ CH₃COO⁻ + H⁺ pka: 4,75
Where CH₃COOH is the acid and CH₃COO⁻ is the conjugate base.
Thus, Henderson-Hasselbalch formula for acetic acid equilibrium is:
pH = 4,75 + log₁₀![\frac{[CH_{3}COO^-]}{[CH_{3}COOH]}](/tpl/images/0269/9419/7710e.png)
a) The pH is:
pH = 4,75 + log₁₀![\frac{[2 mol]}{[2 mol]}](/tpl/images/0269/9419/ab1e5.png)
pH = 4,75
b) The pH is:
pH = 4,75 + log₁₀![\frac{[2 mol]}{[1mol]}](/tpl/images/0269/9419/4feda.png)
pH = 5,05
I hope it helps!