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.
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 of gas is passed through lime water ?
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CaCO3 + zHcl→ CaCl2 + H2O + CO2
Marble is calcium carbonate and on reacting with HCI releases CO2.
Ca(OH)2 +CO2→CaCO3+H2O
.Ca(OH)2 -Lime water
CaCO3 -White ppt
Lime water turns milky due to the formation of white precipitate of CaCO3. On passing excess CO2, milkIness disappears because Ca(HCO3)2 is formed which is soluble in water.
CaCO3+H2O+CO2→ Ca(HCO3)2
Ca(HCO3)2 - Soluble in water
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