
When excess of gas A was passed through solution B a white precipitate was obtained which turned colourless.
(a) Name A and B
(b) Name the product formed after each reaction
(c) State balanced chemical equation involved
Answer
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Hint: Try to think of a reaction in which a gas reacts with a colourless solution to form white ppt. Remember Calcium carbonate\[\left( {CaC{O_3}} \right)\]has milky appearance and Calcium bi-carbonate \[Ca(HC{O_3})\] is colourless.
Complete step by step answer:
When (\[C{O_2}\] ) carbon dioxide gas is passed through a solution of lime water the solution turns milky. This is due to the formation of\[\left( {CaC{O_3}} \right)\]Calcium carbonate. The chemical reaction is as follows:
\[C{O_2} + Ca{(OH)_2} \to CaC{O_3} + {H_2}O\]
When excess carbon dioxide (\[C{O_2}\]) is passed through a solution of Calcium carbonate \[\left( {CaC{O_3}} \right)\]the milkiness disappears. This is due to the formation of Calcium bi-carbonate\[Ca{(HC{O_3})_2}\]. The chemical reaction is as follows:
\[CaC{O_3} + {H_2}O + C{O_2} \to Ca{(HC{O_3})_2}\]
(a) Hence gas A is\[C{O_2}\] and solution B is lime water .
(b ) \[C{O_2} + Ca{(OH)_2} \to CaC{O_3} + {H_2}O\]
The product formed when Carbon dioxide reacts with Lime water is Calcium Carbonate.
\[CaC{O_3} + {H_2}O + C{O_2} \to Ca{(HC{O_3})_2}\]
The product formed when excess of Carbon dioxide (\[C{O_2}\]) is passed through a solution of Calcium Carbonate \[\left( {CaC{O_3}} \right)\] and water (\[C{O_2}\]) is of Calcium bi-carbonate (\[Ca{(HC{O_3})_2}\]).
(c) The balanced chemical equation for each step is as follows:
\[C{O_2} + Ca{(OH)_2} \to CaC{O_3} + {H_2}O\]
\[CaC{O_3} + {H_2}O + C{O_2} \to Ca{(HC{O_3})_2}\]
Note: (1) Calcium bicarbonate - Calcium bicarbonate is also known as Calcium hydrogen carbonate. Calcium bicarbonate is white in colour. It can be used as a colouring agent and in food. This term does not refer to a known solid compound because it is found only in aqueous solution. A solution is known as an aqueous solution in which the solvent is water. Calcium bicarbonate containing ions such as calcium (\[C{a^{2 + }}\]),bicarbonate (\[HCO_3^ - \]), and carbonate (\[CO_3^{2 - }\]).
(2) Calcium Carbonate - Calcium Carbonate is found on mineral rocks. Calcium Carbonate is used for refining of sugar, added to the swimming pool to maintain pH level. This is also used as antacid.
Complete step by step answer:
When (\[C{O_2}\] ) carbon dioxide gas is passed through a solution of lime water the solution turns milky. This is due to the formation of\[\left( {CaC{O_3}} \right)\]Calcium carbonate. The chemical reaction is as follows:
\[C{O_2} + Ca{(OH)_2} \to CaC{O_3} + {H_2}O\]
When excess carbon dioxide (\[C{O_2}\]) is passed through a solution of Calcium carbonate \[\left( {CaC{O_3}} \right)\]the milkiness disappears. This is due to the formation of Calcium bi-carbonate\[Ca{(HC{O_3})_2}\]. The chemical reaction is as follows:
\[CaC{O_3} + {H_2}O + C{O_2} \to Ca{(HC{O_3})_2}\]
(a) Hence gas A is\[C{O_2}\] and solution B is lime water .
(b ) \[C{O_2} + Ca{(OH)_2} \to CaC{O_3} + {H_2}O\]
The product formed when Carbon dioxide reacts with Lime water is Calcium Carbonate.
\[CaC{O_3} + {H_2}O + C{O_2} \to Ca{(HC{O_3})_2}\]
The product formed when excess of Carbon dioxide (\[C{O_2}\]) is passed through a solution of Calcium Carbonate \[\left( {CaC{O_3}} \right)\] and water (\[C{O_2}\]) is of Calcium bi-carbonate (\[Ca{(HC{O_3})_2}\]).
(c) The balanced chemical equation for each step is as follows:
\[C{O_2} + Ca{(OH)_2} \to CaC{O_3} + {H_2}O\]
\[CaC{O_3} + {H_2}O + C{O_2} \to Ca{(HC{O_3})_2}\]
Note: (1) Calcium bicarbonate - Calcium bicarbonate is also known as Calcium hydrogen carbonate. Calcium bicarbonate is white in colour. It can be used as a colouring agent and in food. This term does not refer to a known solid compound because it is found only in aqueous solution. A solution is known as an aqueous solution in which the solvent is water. Calcium bicarbonate containing ions such as calcium (\[C{a^{2 + }}\]),bicarbonate (\[HCO_3^ - \]), and carbonate (\[CO_3^{2 - }\]).
(2) Calcium Carbonate - Calcium Carbonate is found on mineral rocks. Calcium Carbonate is used for refining of sugar, added to the swimming pool to maintain pH level. This is also used as antacid.
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