What is the pH of 0.033 M HCl? WebAssign will check your answer for the correct

Question

What is the pH of 0.033 M HCl? WebAssign will check your answer for the correct number of significant figures. 12.52

The pH of 0.033 M HC2H3O2 is 3.11. Why don't the two equimolar solutions of HCl and HC2H3O2 have the same pH? (Select all that apply.)

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

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.

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

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.

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

What is the hydronium ion concentration in a solution with pH = 2.16?

An unknown bottle of acid says 0.0010 M on the label. The measured pH is 3.00.

This implies that the unknown acid has which of the following?

Ka >> 1

Ka << 1

Ka ? 1

Which of the acids below will have the lowest pH in a 0.0010 M solution of the acid? (Hint: Larger Ka values favor products and smaller Ka values favor reactants.)

HClO

HCO3?

HNO2

HSO4?

Explanation / Answer

Ans 1

Concentration of HCl = 0.033 M

Dissociation of HCl

HCl = H+ + Cl-

[H+] = 0.033 M

pH = - log [H+]

= - log (0.033)

= - (-1.48)

= 1.48

pOH = 14 - pH

= 14 - 1.48 = 12.52

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