Question

Which of the following is a tribasic acid?

• A. $H_{3}PO_{4} $
• B. $ HPO_{3} $
• C. $ H_{4}P_{2}O_{7} $
• D. $ H_{4}P_{2}O_{6} $

Answer 1

Answer: (A)

$H _{3} PO _{4}$ (orthophosphoric acid) is a tribasic acid because it has three replaceable hydrogen atoms.