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A sample of HgCl2 weighing 9.41g is dissolved

2022-08-11 23:24:58 问答库阅读 192 次

问题详情

A sample of HgCl₂ weighing 9.41g is dissolved in 32.75g of ethanol, C₂H₅OH. The boiling-point elevation of the solution is 1.27℃. Is HgCl₂ an electrolyte in ethanol？ Show your calculations. (K_b=1.20K.kg.mol^-1)

参考答案

Solution: If HgCl₂ is not an electrolyte in ethanol
b(HgCl₂)=[9.41/(271.5×0.03275)]mol·kg^-1
=1.06mol.kg
now, △T_b=K_b(ethanol)×b(HgCl₂)
b(HgCl₂)=△T_b/K_b(ethanol)
=[1.27/1.20]mol.kg^-1
=1.06mol.kg^-1
Therefor, HgCl₂ is not an electrolyte in ethanol.