Question

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
c is the highest
a is the lowest
thx

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