Q8 of 270 Page 66

Name the gas evolved when dilute HCL reacts with sodium hydrochloric. How is it recognized?

The gas evolved when sodium hydrogen carbonate reacts with HCl is Carbon dioxide.

NaHCO3 + HCl ---->NaCl + H2O +CO2


The gas can be identified by passing through the lime water. when carbon dioxide passes through the lime water, it turns milky due to the formation of calcium carbonate which is insoluble in water.


Ca(OH)2 + CO2 ----> CaCO3 + H2O.




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6 When a solution is added to vanilla extract, then the characteristic smell of vanilla cannot be detected. State whether the given solution is an acid or a base. 7 How will you test for the gas which is liberated when hydrochloric acid reacts, with an active metal? 9 Give the names and formulae of two strong acids and two weak acids. 10 Name one natural source of each of the following acids:

(a) Citric acid (b) Oxalic acid


(c) Lactic acid (d) Tartaric acid