question_answer

6.2 g of a sample containing \[N{{a}_{2}}C{{O}_{3}},\,NaHC{{O}_{3}}\] and non- volatile inert impurity on gentle heating loses 5% of its mass due to reaction \[2\,Na\,HC{{O}_{3}}\xrightarrow{{}}N{{a}_{2}}C{{O}_{3}}+{{H}_{2}}O+C{{O}_{2}}.\] Residue is dissolved in water and formed 100 mL solution and its 10 mL portion requires 7.5 mL of 0.2 M aqueous solution of \[BaC{{l}_{2}}\] for complete precipitation of carbonates. Determine mass (in g) of \[N{{a}_{2}}C{{O}_{3}}\]in the original sample.

Answer:

1.06