A student dropped few pieces of marble in dilute hcl contained in a test tube the evolved gas was then passed through lime water what change would you observe in lime water what will happen if excess gas is passed through the lime water write necessary equation
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CO2 gas
observation : the evolved gas turns the lime water into milky white (precipitate formed)
Confirmation = the gas evolved is CO2.
Equation : Ca(OH)2 + CO2 ~~ CaCO3 + H20
Excess CO2 : Ca(OH)2 + H2O + CO2 ~~ Ca(HCO3)2
(calcium bicarbonate)
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