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Which species is formed when H2PO4− loses one proton?
- H3PO4
- P2O5
- PO43−
- HPO42−
Correct answer: HPO42−
Solution
When H2PO4− loses one proton (H+), it becomes HPO42−, which is the next species in the dissociation of phosphoric acid. This process reflects the stepwise deprotonation of the phosphate ion.
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