Question

Which of the following is a tribasic acid?

• A. $H_{2}C{O}_3$
• B. $HN{O}_3$
• C. $H_{3}P{O}_4$
• D. $C{H}_{3}COOH$

Answer 1

The correct option is C

$H_{3}P{O}_4$

Tribasic acid has three hydrogen ions to donate to a base in a neutralisation reaction. Phosphoric acid $H_{3}P{O}_4$ forms 3 hydrogen ions on decomposition, thus its a tribasic acid.