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Alex73 [517]
3 years ago
10

The first disinfectant used by Joseph Lister was called carbolic acid. This substance now is known as phenol, C6H5OH (pKa = 9.90

). What is the pH of a 0.10 M solution of phenol?
Chemistry
1 answer:
ICE Princess25 [194]3 years ago
3 0

Answer:

5.5

Explanation:

Phenol is a weak acid that dissociates according to the following reaction.

C₆H₅OH(aq) ⇄ C₆H₅O⁻(aq) + H⁺(aq)

The pKa is 9.90. The acid dissociation constant (Ka) is:

pKa = -log Ka

Ka = antilog -pKa = antilog -9.90

Ka = 1.26 × 10⁻¹⁰

Given the concentration of the acid, Ca = 0.10 M, and the Ka, We can find [H⁺] using the following expression.

[H⁺] = √(Ka × Ca)

[H⁺] = √(1.26 × 10⁻¹⁰ × 0.10)

[H⁺] =3.5 × 10⁻⁶ M

The pH is:

pH = -log [H⁺]

pH = -log 3.5 × 10⁻⁶

pH = 5.5

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Fe2O3 + _H2SO4 → _Fe2(SO4)3 + __H2O what are the coefficients
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Answer:

Fe₂O₃ + 3H₂SO₄ → Fe₂(SO₄)₃ + 3H₂O

Explanation:

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3 years ago
What is the molecular formula for Hydrochloric acid​
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Which compound is an ester? A) CH3OH B) CH3COOH C) CH3OCH3 D) CH3COOCH3
s344n2d4d5 [400]

Answer:

Option D) CH3COOCH3

Explanation:

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