How is PH3 prepared in the laboratory ? How is it puried ?
How is PH3 prepared in the laboratory ? How is it puried ? How does the solution of PH3 in water react on irradiation with light and on adsorption in CuSO4 ? How can you prove that PH3 is basic in nature ? Write chemical equations for all the reactions involved.
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[Hint : P4 + 3NaOH + 3H2O→ PH3 + 3NaH2PO2
It is puried by absorbing it in HI to form PH4I which on treating with KOH
gives off phosphine.
PH4I + KOH → KI + H2O + PH3
PH3 in water decomposes into red phosphorus and hydrogen in presence of
light.
4PH3 →P4 + 6H2
Reaction with CuSO4 :
3CuSO4 + 3PH3 → Cu3P2 + 3H2SO4]
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