<prompt> Use of soda lime in anesthesia is?As a hardnerAs an absorbentAs a softnerAs an indicator  <response>: Ans is b i.e. As an absorbent Soda lime is the most commonly used C02 absorbent.Soda lime Most commonly used CO2 absorbent. The composition of Soda lime is: -i Ca OH2 - 94ii NaOH - 5 Catalystiii KOH - 1iv Silica - To prevent dust formationv Indicatorvi Moisturevii Granule size - 4 - 8 mesh 100 gm of sodalime can absorb upto 23 litres of CO2 Now a days a good quality sodalime with prolonged life, Durasorb is used which is pink when fresh and becomes white when exhausted. Trichloroethylene Trilene and sevoflurane reacts with sodalime - So, these agents should not be used in closed circle system. Trilene produces phosgene causing ARDS and dichloroacetylene causing neurotoxicity which involves 5th cranial nerve most commonly. Sevoflurane produces compound A which is nephrotoxic. Other CO2 absorbents used are:-i Baralyme Barium hydroxide lime - It is an alternative to Sodalimeii Amsorb - is consists of calcium hydroxide and calcium chloride 