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Question
Give reasons :
1. In the laboratory preparation of HCL acid from NACL and conc H2SO4 , the residual salt formed at temperatures above 200 °C forms a hard crust and stick to the glass. [2]
2. In the fountain experiment to demonstrate the high solubility of HCL gas in water , dry HCL gas is filled in the round bottom flask. [2]
1. In the laboratory preparation of HCL acid from NACL and conc H2SO4 , the residual salt formed at temperatures above 200 °C forms a hard crust and stick to the glass. [2]
2. In the fountain experiment to demonstrate the high solubility of HCL gas in water , dry HCL gas is filled in the round bottom flask. [2]
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Solution
(1)The reaction proceeds as,
H2SO4 + 2 NaCl -------> 2 HCl + Na2SO4
Formation of hard crust of Na2SO4 which sticks to glass
(2)When the HCl gas dissolves, water is sucked up to create a fountain, this creates a lot of vacuum which may lead to imploding of the flask. In Round Bottom Flask the pressure is equally distributed and hence is safer to conduct the experiment.
H2SO4 + 2 NaCl -------> 2 HCl + Na2SO4
Formation of hard crust of Na2SO4 which sticks to glass
(2)When the HCl gas dissolves, water is sucked up to create a fountain, this creates a lot of vacuum which may lead to imploding of the flask. In Round Bottom Flask the pressure is equally distributed and hence is safer to conduct the experiment.
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