pBlock ElementsII - Result Question 99

####95. Draw balanced equations for

(i) the preparation of phosphine from CaO and white phosphorus.

(ii) the preparation of ammonium sulphate from gypsum, ammonia and carbon dioxide.

(1990,2M)

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Solution:

  1. (i) 15CaO+4P4Δ5Ca3P2+3P2O5

[Ca3P2+6H2O3Ca(OH)2+2PH3]×5

15CaO+4P4+30H2O15Ca(OH)2

+3P2O5+10PH3

(ii) 2NH3+CO2+H2O(NH4)2CO3 CaSO4+(NH4)2CO3CaCO3+(NH4)2SO4 gypsum

CaSO4+2NH3+CO2+H2OCaCO3+(NH4)2SO4



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