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Activity 2.9Take about lg solid NaCl in a clean anddry test tube and set up the apparatus asshown in Fig. 2.4.Add some concentrated sulphuric acid tothe test tube.What do you observe? Is there a gas comingout of the delivery tube?Test the gas evolved successively with dryand wet blue litmus paper.In which case does the litmus paper changecolour?On the basis of the above Activity, what doyou infer about the acidic character of:(i) dry HCl gas(ii) HCl solution? |
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Answer» Answer: Yes, Hydrochloric gas comes out from the test tube. The following reaction took place. 2NaCl(s) + H2SO4(l) - NA2SO4(aq) + 2HCl(g) When tested with DRY litmus paper, it's colour do not change but when it is tested with a wet litmus paper, it's colour changes from blue to red DUE to the formation of hydrochloric acid on the litmus paper. (i) From the above activity we infer that Dry HCl gas do not shows it ACIDIC behavior due to the absence of water. (II) HCl solutions shows it's acidic behavior as it is dissolved in water and dissociates into H+ and Cl- ions. Out of these, H+ ions are responsible for it's acidic behavior. Hope you understand. |
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