Question

A water insoluble substance x on reacting with dilute h2so4 released a colourless and odourless gas with brisk effervescences. When the gas was passed through water ,the solution obtained turn blue litmus red .On bubbling the gas through the lime water ,it initially become milky and the milkiness disappeared when the gas was passed in excess .Identify the substance x and write the chemical equation of the reaction involve

Answer 1

Answer:

the substance X is Na2CO3

when it reacts with sulphuric acid, then the following reaction takes place ,

Na2CO3 + H2SO4 -----------------> Na2SO4 +CO2+H2O

on passing CO2 from lime water,

Ca(OH)2 + CO2 --------------------> CaCO3+H2O

when excess of CO2 is passed the milkiness is removed and calcium hydrogen carbonate is formed,

CaCO3 + CO2 + H2O ---------------------> Ca(HCO3)2