Question 1
Which of the following is TRUE?
◦ Phosphoric acid is used to produce the "fizziness" in soda.
◦ Sodium phosphate is an additive in baked goods to give them a longer shelf life.
◦ The phosphorus in the phosphite ion has an oxidation state of -3.
◦ Phosphorus can range in oxidation state from -3 to +5.
◦ Phosphoric acid is a very strong oxidizing agent, just like nitric acid.
Question 2
Tetraphosphorus decoxide reacts with water to produce phosphoric acid. Write a balanced reaction for this process.
◦ P
4O
10 + 4H
2O → 4H
2PO
3◦ P
4 + 3O
2 +
6H
2O → 4H
3PO
3◦ P
2O
5 + 3H
2O → 2H
3PO
3◦ P
4 + 3O
2 +
6H
2O → 4H
3PO
4◦ P
4O
10 + 6H
2O → 4H
3PO
4