Gas forming reactions - Sometimes a gas will be involved as...

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Sometimes a gas will be involved as one of the reactants or products in a solution reaction. For example, 2 HCl (aq)  + Na 2 S (aq)    H 2 S (gas)  + 2 NaCl (aq) In this example the complete ionic equation would be: 2 H + (aq)  + 2Cl - (aq)  + 2Na + (aq)  + S 2- (aq)    H 2 S (g)  + 2Na + (aq)  + 2Cl - (aq) Removing the spectator ions we obtain the net ionic equation: 2 H + (aq)  + S 2- (aq)    H 2 S (g) H 2 S  is just one example of a gaseous substance that can form in a solution reaction. Another way gases can  form in solution is through the decomposition of weak electrolytes. For example,  H 2 CO 3  readily decomposes  into  H 2 O  and  CO 2  gas, H 2 CO 3 (aq)    H 2 O (l)  + CO 2 (g) So, any solution reaction that leads to the production of  H 2 CO 3 , such as HCl (aq)  + NaHCO 3 (aq)    NaCl (aq)  +  H 2 CO 3 (aq) will ultimately lead to the production of 
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This note was uploaded on 10/13/2011 for the course CHEMISTRY 121 taught by Professor Staff during the Fall '10 term at Bangladesh University of Eng and Tech.

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Gas forming reactions - Sometimes a gas will be involved as...

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