A student dropped few pieces of marble in dilute hydrochloric acid contained in a test tube. The evolved gas was then passed through lime water . What change would be observed in lime water ? What will happen if excess gas is passed through the lime water ? With the help of Balanced chemical equation for all the changes explain the observation.
A student dropped few pieces of marble in dilute hydrochloric acid contained in a test tube. The evolved gas was then passed through lime water . What change would be observed in lime water ? What will happen if excess gas is passed through the lime water ? With the help of Balanced chemical equation for all the changes explain the observation.
Marble is chemically calcium carbonate. When dilute HCl is added to calcium carbonate, it forms calcium chloride, water and carbon dioxide. The chemical equation for the reaction is as follows
CaCO3 + 2HCl → CaCl2 + H2O + CO2
Carbon dioxide gas turns lime water milky due to the formation of calcium carbonate. Following is the chemical equation showing the reaction between lime water and carbon dioxide.
Ca(OH)2 + CO2 → CaCO3 + H2O
on passing excess CO2, milkiness disappears because Ca(HCO3)2 is formed which is soluble in water.
CaCO3 + H2O + CO2 → Ca(HCO3)2
Soluble in water
Marble is chemically calcium carbonate. When dilute HCl is added to calcium carbonate, it forms calcium chloride, water and carbon dioxide. The chemical equation for the reaction is as follows
CaCO3 + 2HCl → CaCl2 + H2O + CO2
Carbon dioxide gas turns lime water milky due to the formation of calcium carbonate. Following is the chemical equation showing the reaction between lime water and carbon dioxide.
Ca(OH)2 + CO2 → CaCO3 + H2O
on passing excess CO2, milkiness disappears because Ca(HCO3)2 is formed which is soluble in water.
CaCO3 + H2O + CO2 → Ca(HCO3)2
Soluble in water
