Why is phosphoric acid dibasic?

Related questions

1. Is acetic acid stronger than phosphoric acid?
2. Which elements are acids?
3. Which is stronger acid hno3 or hno2?
4. What is the difference between Sulphuric acid and sulphurous acid?
5. Which is stronger Sulphuric or sulphurous acid?
6. Why is Sulphuric acid stronger than Ethanoic acid?
7. Is sulfurous acid dangerous?
8. What is sulfurous acid used for?
9. Is sulphurous acid a monobasic acid?
10. Is HCl or sulfuric acid stronger?

Tags

1. #phosphoric
2. #attached
3. #salts
4. #written
5. #therefore
6. #protons
7. #acidic
8. #atoms
9. #called
10. #phosphates
11. #tribasic
12. #three
13. #oxygen
14. #h3po4
15. #nature
16. #phosphorus