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A gas is liberated immeiately with a brisk effervescence, when you add acetic acid to sodium hydrogen carbonate power in a test tube. Name the gas and describe the test that confirms the identify of the gas.

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The liberated gas is `CO_(2)` gas. The test that confirms the identity of the gas is its test with lime water. `CO_(2)` gas turns the lime water milky.
`underset("Lime water")(Ca(OH)^(2) (aq)+CO_(2)) rarr underset("White ppt")(CaCO_(3) (s))+H_(2)O`

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