Question

4. Dilute solution of acetic acid 1 point
contains *
Hydronium ions, acetate ions and
water molecules
O Hydrogen ions and acetate ions
O
Hydronium ions, acetate ions, acetic
acid molecules and water molecules
O
Hydrogen ions, acetic acid
molecules and hydronium ions
5 Carbon compounds have *
1oint​

Answer 1

Explanation:

The hydrogen ion concentration of a 1.0 M acetic acid solution can be calculated as follows: The solution contains 1.0 mol acetic acid in 1.0 L solution. Because acetic acid is a weak electrolyte, only a small fraction of the molecules ionize to hydrogen and acetate ions; most remain as un-ionized acetic acid molecules. Let x stand for the number of moles of acetic acid that ionize. If x moles ionize, then 1.0 - x moles of acetic acid remain un-ionized. For x moles of acetic acid that ionize, x moles of H+ and x moles of C2H3O2- are formed. The resulting concentrations of acetic acid, hydrogen ion, and acetate ion at equilibrium are

HC2H3O2

1.0 - x

H+

x +

C2H3O2-

x

Substituting these values into the expression for the acid dissociation constant gives:

Ka = [H+][C2H3O2-]

[HC2H3O2] = (x)(x)

1.0 - x = 1.8 X 10-5

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