Acids, bases and buffers

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Question 13
Medium

Chloroxylenol is an antiseptic and disinfectant with the structure shown below.

The chemical structure of chloroxylenol. It consists of a benzene ring with a hydroxyl group (-OH) at position 1 (top position), a methyl group (-CH3) at position 3, another methyl group (-CH3) at position 5, and a chlorine atom (-Cl) at position 4 (bottom position).

Chloroxylenol is a weak Brønsted–Lowry acid.

a.

What is the systematic name of chloroxylenol?

[1]
b.

Predict the number of peaks in a 13C^{13}\text{C}13C NMR spectrum of chloroxylenol.

[1]
c.

A student measures the pH of a disinfectant solution containing chloroxylenol to be 5.24.

The label on the bottle shows the percentage of chloroxylenol in the solution as 4.80% (weight/volume), meaning 100 cm3100\text{ cm}^3100 cm3 of the solution contains 4.80 g4.80\text{ g}4.80 g of chloroxylenol.

Assume the following:

  • Chloroxylenol is the only acidic component in the solution.
  • Chloroxylenol is a weak monobasic acid.
  • The density of the solution is 1.00 g cm−31.00\text{ g cm}^{-3}1.00 g cm−3.

Write the equation, using molecular formulae, for the acid dissociation of chloroxylenol, and calculate the acid dissociation constant, KaK_{\text{a}}Ka​, for chloroxylenol.

[5]

Acids, bases and buffers Questions

  1. A Level
  2. /Chemistry
  3. /Acids, bases and buffers