all-of-the-following-substances-form-a-buffer-excepta-1-0-m-h2co3-1-0-m-nahco3b-

Question

All of the following solutions form a buffer except:
I. 1.0 M H₂CO₃ and 1.0 M NaHCO₃
II. 1.0 M CH₃NH₂ and 1.0 M CH₃NH₃Cl
III. 1.0 M NaOH and 1.0 M HBr
IV. 1.0 M CH₃NH₂ and 1.0 M HBr
V. 1.0 M H₃PO₄ and 1.0 M NaH₂PO₄

Accepted Answer

III and V

Answer

I and V

Answer

III and IV

Answer

I and IV