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01/11/2020 10:53 am
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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? With the help of balanced chemical equations for all the changes explain the observations.
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01/11/2020 11:00 am
CaCO3 + 2HCl (dil.) → CaCl2 + H2O + CO2
Lime water will turn milky due to liberation of CO2
Ca(OH)2(aq) + CO2 → CaCO3 + H2O(l)
If excess of CO2 gas is passed through lime water, milkyness will disappear due to the formation of Ca(HCO3)(aq) which is soluble in water.
CaCO3 + H2O(l) + CO2 → Ca(HCO3)2(aq)