Phosphoric acid is a triprotic acid, so H3PO4, H2PO4 -, and HPO4 2- are all acids. Which of the solutions below would have the lowest pH?

0.1 M NaH2PO4
0.1 M Na2HPO4
0.1 M Na3PO4

2 answers

c is the highest
a is the lowest
thx