Question

Carbon dioxide reacts with limewater (a solution of calcium hydroxide, Ca(OH) 2), to form a white precipitate (appears milky) of calcium carbonate, CaCO 3. Adding more carbon dioxide results in the precipitate dissolving to form a colourless solution of calcium hydrogencarbonate.

Answer 1

Answer:

• 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, CaCO3 . The solution will turn milky due to the fact that calcium carbonate is a white precipitate.
• The reaction between limewater, which is a solution of calcium hydroxide, Ca(OH)2 , and carbon dioxide will resulting in the formation of an insoluble solid called calcium carbonate, CaCO3 .
• 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

• 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.

Explanation:

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