Midterm Question (#3.D)

[juleschang16]

On the midterm Q3B was:
Phosphoric acid (additive E338) is used to acidify foods and beverages such as various colas and jams and provides a tangy or sour taste.
Write the reaction that represents Ka2 for phosphoric acid (H3PO4).

How would you go about solving this?

[Marcela Udave 1F]

The solutions for the midterm are posted on the class website!

[Kathryn Wilhem 1I]

The reaction is with a polyprotic acid, so it can donate more than one proton, so there will be more than one reaction. They are asking for the second reaction, so you must first write the reaction with the first proton donated, then write the reaction with the second proton donated.