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How does carbon dioxide react with limewater ?

Answer 1

Carbon dioxide reacts with limewater to form calcium carbonate, which precipitates out of the solution.

The reaction between limewater, which is a solution of calcium hydroxide, #"Ca(OH)"_2#, and carbon dioxide will result in the formation of an insoluble solid called calcium carbonate, #"CaCO"""_3#.

#Ca(OH)_(2(aq)) + CO_text(2(aq]) -> CaCO_(3(s)) darr + H_2O_((l))#

The solution will turn milky due to the fact that calcium carbonate is a white precipitate. This reaction is actually used to test for the presence of carbon dioxide.

An unknown gas is bubbled through a solution of calcium hydroxide - if the solution turns cloudy, then the unknown gas is carbon dioxide.

If you continue to bubble the carbon dioxide through the limewater another acid - base reaction occurs which results in the precipitate dissolving to give soluble calcium hydrogen carbonate:

#CO_(2(g))+H_2O_((l))+CaCO_(3(s))rarrCa(HCO_3)_(2(aq))#

This is how naturally ocurring acid rain is able to chemically erode limestone resulting in cave formation.

When this solution evaporates the reverse reaction occurs resulting in the formation of stalactites and stalagmites.

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Answer 2

Cooper Adams

Carbon dioxide reacts with limewater (calcium hydroxide) to form calcium carbonate (a white precipitate) and water. This reaction is represented by the equation: CO2 + Ca(OH)2 -> CaCO3 + H2O.

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Answer 3

Cameron Andrews

Carbon dioxide reacts with limewater (calcium hydroxide solution) to form calcium carbonate (a white precipitate) and water. The chemical equation for this reaction is:

$\text{CO}_2(g) + \text{Ca(OH)}_2(aq) \rightarrow \text{CaCO}_3(s) + \text{H}_2\text{O}(l)$

In words, carbon dioxide gas reacts with calcium hydroxide solution to produce calcium carbonate solid and water. This reaction is commonly used in the laboratory to test for the presence of carbon dioxide gas, as the formation of the white precipitate indicates the presence of CO2.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.