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  4. A mixture of salts was treated to determine the barium content. A 0.230g sample was dissolved and treated with excess potassium chromate. The precipitate of BaCrO4 was dissolved in dil HCl to convert BaCrO4 to textCr2 textO72 - anion. The solution treated with excess sodium iodide and tri Iodide produced was titrated with 21 mL of 0.095 M sodium thiosulphate. Calculate the % of textBaCl2 ⋅ 2 textH text2 textO in the sample. [given Molar Mass of BaCl2.2H2O = 244]

Q. A mixture of salts was treated to determine the barium content. A 0.230g sample was dissolved and treated with excess potassium chromate. The precipitate of BaCrO4 was dissolved in dil HCl to convert BaCrO4 to anion. The solution treated with excess sodium iodide and tri Iodide produced was titrated with 21 mL of 0.095 M sodium thiosulphate. Calculate the % of in the sample. [given Molar Mass of BaCl2.2H2O = 244]

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Solution:

The skeletal reactions are

Meqs of Na2S2O3 = 21 x 0.095 x 1 = 1.995 Meqs of
Meqs of
mM of
mM of mM of BaCrO4
Mass % of BaCl2 . 2H2O

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