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Explain the exchange reactions of deuter...

Explain the exchange reactions of deuterium

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When compounds containing hydrogen are treated With `D_2O`, hydrogen undergoes an exchange with deuterium
`2NaOH+D_2Oto2NaOD+HOD`
`HCl+D_2OtoDCl+HOD`
`NH_4Cl+4D_2OtoND_4Cl+4HOD`
These exchange reactions are useful in determing the number of ionic hydrogens present in a given compound. For example, when `D_2O` is treated with of hypophosphorus acid only one hydrogen atom is exchanged wiht deuterium. It indicates that, it is a monobasic acid.
`H_3PO_2+D_2OtoH_2DPO_2+HDO`
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Explain about the exchange reactions of deuterium oxide.

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