How can we detect the presence of carbon dioxide produced during the reaction of vinegar and baking soda
Answers
HELLO THERE!
Let's check out the reaction first!
NaHCO₃ + CH₃COOH ------> CH₃COONa + H₂O + CO₂
The question asks to detect the presence of carbon dioxide in the reaction, hence it indirectly asks for the test of carbon dioxide gas.
=> Carbon dioxide is somewhat acidic, hence it turns blue litmus paper faint red.
=> Carbon dioxide gas turns lime water milky, when it is passed through it batch by batch. On passing excess of the gas through the milky lime water, the lime water becomes colourless again.
=> When carbon dioxide gas is bubbled through nitric acid (which is kept open for some time), the yellow colour of nitric acid vanishes and it becomes colourless.
Explanation: When nitric acid is kept open for some time, it decomposes, forming nitrogen dioxide gas, which is brown in colour. When this gas gets dissolved into nitric acid, the acid turns yellow in colour. WHen carbon dioxide gas is bubbled through the yellow nitric acid, it drives out the dissolved nitrogen dioxide gas, and hence, the acid solution turns colourless.
Extra tests: Carbon dioxide gas does not have any effect on alkaline potassium permanganate or acidified potassium dichromate paper.
THANKS!