Problem: For the polyprotic acid H3PO4 (phosphoric acid), which of the following expressions would correspond to Ka3?1. H3PO4 ⇌ PO43− + 3 H+2. PO43− + 3 H+ ⇌ H3PO43. HPO42− ⇌ PO43− + H+4. H2PO4− ⇌ HPO42− + H+5. H3PO4 ⇌ H2PO4− + H+ 

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For the polyprotic acid H3PO4 (phosphoric acid), which of the following expressions would correspond to Ka3?

1. H3PO4 ⇌ PO43− + 3 H+

2. PO43− + 3 H+ ⇌ H3PO4

3. HPO42− ⇌ PO43− + H+

4. H2PO4 ⇌ HPO42− + H+

5. H3PO4 ⇌ H2PO4 + H+

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