8. Which statement below is NOT correct for the pH of a 0.01 M NaCl solution ver

Question

8.         Which statement below is NOT correct for the pH of a 0.01 M NaCl solution versus the pH of a 0.01 M in FeSO4 solution? Why?

A)        The activity coefficient for H+ will be larger in 0.01 M NaCl than in 0.01 M FeSO4.

B)        The activity coefficient for OH will be larger in 0.01 M NaCl than in 0.01 M FeSO4.

C)        The hydronium concentration in 0.01 M NaCl will equal the hydronium concentration in 0.01 M FeSO4.

D)        The H+ activity in 0.01 M NaCl will not equal the H+ activity in 0.01 M FeSO4.

E)        The OH activity in 0.01 M NaCl will not equal the OH activity in 0.01 M FeSO4.

Explanation / Answer

8. For pH of 0.01 M NaCl versus pH of 0.01 M FeSO4, the following statement below is not correct,

C) The hydronium ion concentration of 0.01 M NaCl will equal the hydronium ion concentration of 0.01 M FeSO4.

FeSO4 hydrolyzes with 2 moles of H2O to form 2 moles of OH-, as opposed to NaCl which gives 1 mole of OH-. So the H+ concentration would also not be same for the two solutions.

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