When 4 gm of a impure sample of waxy white non metallic solid X dissolved in boiling caustic soda in inert environment gives a foul smell gas. Foul smell gas require 4.77 gm of copper sulphate from aq

Question

When 4 gm of a impure sample of waxy white non metallic solid X dissolved in boiling caustic soda in inert environment gives a foul smell gas. Foul smell gas require 4.77 gm of copper sulphate from aq. solution for complete absorbtion.

Calculate the percentage purity of given non metallic solid X.

(Impurities show no reaction with caustic soda)

[Given : Atomic mass of H = 1, O = 16, Na = 23, P = 31, S = 32, Cu = 63]

TestHub · Accepted Answer

P 4 ​ × g m + 3 N a O H + 3 H 2 ​ O → P H 3 ​ + 3 N a H 2 ​ P O 2 ​ x gram x/124 mole 124 x ​ m o l e 2 P H 3 ​ + 3 C u S O 4 ​ → C u 3 ​ P 2 ​ + 3 H 2 ​ S O 4 ​ x/124 mole n C u S O 4 ​ ​ = 2 3 ​ × 124 x ​ w t C u S O 4 ​ ​ = 2 3 ​ × 124 x ​ × 159 = 4.77 x = 159 4.77 ​ × 124 × 3 2 ​ x = 2.48 % P u r i t y = 4 2.48 ​ × 100 = 62%

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