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​​​​​Correctly label the speciation diagram below:

  1. $\mathrm{I}=\mathrm{PO}_{4}{ }^{3-}, \mathrm{II}=\mathrm{HPO}_{4}{ }^{2-}, \mathrm{III}=\mathrm{H}_{2} \mathrm{PO}_{4}{ }^{-}, \mathrm{IV}=\mathrm{H}_{3} \mathrm{PO}_{4}$
  2. $\mathrm{I}=\mathrm{H}_{3} \mathrm{PO}_{4}, \mathrm{II}=\mathrm{HPO}_{4}{ }^{2-}, \mathrm{III}=\mathrm{H}_{2} \mathrm{PO}_{4}^{-}, \mathrm{IV}=\mathrm{PO}_{4}{ }^{3-}$
  3. $\mathrm{I}=\mathrm{H}_{3} \mathrm{PO}_{4}, \mathrm{II}=\mathrm{H}_{2} \mathrm{PO}_{4}{ }^{-}, \mathrm{III}=\mathrm{HPO}_{4}{ }^{2-}, \mathrm{IV}=\mathrm{PO}_{4}{ }^{3-}$
  4. $\mathrm{I}=\mathrm{PO}_{4}{ }^{3-}, \mathrm{II}=\mathrm{H}_{2} \mathrm{PO}_{4}^{-}, \mathrm{III}=\mathrm{H}_{3} \mathrm{PO}_{4}, \mathrm{IV}=\mathrm{HPO}_{4}{ }^{2-}$

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