What is the pH of 0.074 M HCl? _____________ The pH of 0.074 M HC 2 H 3 O 2 is 2

Question

What is the pH of 0.074 M HCl? _____________

The pH of 0.074 M HC2H3O2 is 2.94. Why don't the two equimolar solutions of HCl and HC2H3O2 have the same pH? (Select all that apply.)

a.At equilibrium, the HCl solution contains mainly undissociated HCl and only small amounts of H3O+.

b.The conjugate base of HC2H3O2, C2H3O2?, generates OH? ions in solution, thus lowering the total concentration of H3O+ ions.

c.At equilibrium, the HC2H3O2 solution contains mainly undissociated HC2H3O2 and only small amounts of H3O+.

d.The Ka of HC2H3O2 is smaller than that of HCl, so at equilibrium the concentration of H3O+ ions in a HC2H3O2 solution is less than in a HCl solution of the same concentration.

e.The Ka of HC2H3O2 is greater than that of HCl, so at equilibrium the concentration of H3O+ ions in a HC2H3O2 solution is less than in a HCl solution of the same concentration.

.

What is the hydronium ion concentration in a solution with pH = 2.66? ___________

Explanation / Answer

1) pH= -log[H+] = -log(0.074) = 1.13

2) Because HCl only releases 1 H+ per mole and HC2H3O2 will release less moles due to the equilibrium formed (not all H+ will be released in solution).

Th letter you should choose is D

d.The Ka of HC2H3O2 is smaller than that of HCl, so at equilibrium the concentration of H3O+ ions in a HC2H3O2 solution is less than in a HCl solution of the same concentration.

3)

If pH = 2.66

Then

pH = -log(H+)

[H+] = 10^-2.66 = 0.0021877

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