A) Sodalime
B) Sodiumbicarbonate
C) Washing soda
D) Sodium chloride
Correct Answer: C
Solution :
Washing soda removes both the temporary and permanent hardness by converting soluble calcium and magnesium compounds into insoluble carbonates. \[CaC{{l}_{2}}+N{{a}_{2}}C{{O}_{3}}\to CaC{{O}_{3}}+2NaCl\] \[CaS{{O}_{4}}+N{{a}_{2}}C{{O}_{3}}\to CaC{{O}_{3}}+N{{a}_{2}}S{{O}_{4}}\] \[Ca{{(HC{{O}_{3}})}_{2}}+N{{a}_{2}}C{{O}_{3}}\to CaC{{O}_{3}}+2NaHC{{O}_{3}}.\]
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