Question:
Which of the following phosphate species does not exist in water?
Which of the following phosphate species does not exist in water?
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Phosphate species in water are determined by pH and include H2PO− 4 , HPO2− 4 , and PO3− 4 . HPO3− 4 is not chemically viable.
Updated On: Feb 20, 2026
- H2PO4−
- HPO42−
- PO43−
- HPO33−
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The Correct Option is D
Solution and Explanation
The following phosphate species exist in water depending on the pH:
- H2PO4−: Exists in acidic conditions.
- HPO42−: Exists in neutral to slightly alkaline conditions.
- PO43−: Exists in highly alkaline conditions.
The species HPO34− does not exist because it would require an impossible intermediate oxidation state of phosphorus.
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