Question

Why does Co2 twinsims water milky

Answer 1

lime water = CaO

when CO2 is passed in lime water it forms CaCO3 which is milky. therefore CO2 turns lime water milky

REACTION -

CaO + CO2 -----> CaCO3

Answer 2

  Insoluble calcium carbonate that is CaCO3 causes Carbon dioxide to turn into lime water milky. 
Lime water + Carbon Dioxide = Insoluble calcium carbonate.