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Hydrogen — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistryHydrogen5 Marks
Question
How can $\text{D}_2\text{O}$ be prepared from water? Mention the physical properties in which $\text{D}_2\text{O}$ differs from $\text{H}_2\text{O}$. Give at least three reactions of $\text{D}_2\text{O}$ showing the exchange of hydrogen with deuterium.
✓

Answer

For preparation of heavy water, there is exhaustive distillation of ordinary water. It is a multistep distillation process. Physical properties
 
 
 $\text{H}_2\text{O}$
$\text{D}_2\text{O}$
1.
Boiling point
373k
374.42k
2.
Melting point
273k
276.82k
3.
Mol. mass
18.016
20.03
Exchange reactions.
$\text{NaOH}+\text{D}_2\text{O}\leftrightharpoons\text{NaOD}+\text{HDO}$
$\text{HCl}+\text{D}_2\text{O}\leftrightharpoons\text{DCl}+\text{HDO}$
$\text{NH}_4\text{Cl}+4\text{D}_2\text{O}\leftrightharpoons\text{ND}_4\text{Cl}+4\text{HDO}$

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