• # question_answer The reagent (s) used for softening the temporary hardness of water is (are) A) $C{{a}_{3}}{{(P{{O}_{4}})}_{2}}$                             B) $Ca{{(OH)}_{2}}$ C) $N{{a}_{2}}C{{O}_{3}}$                               D) $NaOCl$

Solution :

$Ca{{(OH)}_{2}}+Ca{{(HC{{O}_{3}})}_{2}}\to 2CaC{{O}_{3}}\downarrow +\underset{(Clark's\,method)}{\mathop{2{{H}_{2}}O}}\,$Z$NaOH+{{H}_{2}}\to NaOH+HOCl$ $H{{O}^{-}}+HCO_{3}^{-}\to CO_{3}^{2-}+{{H}_{2}}O$ $Ca{{(HC{{O}_{3}})}_{2}}+N{{a}_{2}}C{{O}_{3}}\to CaC{{O}_{3}}\downarrow +2NaHC{{O}_{3}}$

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