Calculate the molar concentration of an iodate solution prepared by dissolving 1

Question

Calculate the molar concentration of an iodate solution prepared by dissolving 1.33 g of KIO_3 and diluting to volume with distilled water in a 100-mL volumetric flask. Calculate the molar concentration of a thiosulfate solution from the following information: A 30.-mL aliquot of a 0.0114 M KIO_3 solution is added to a flask containing 2 g of KI and 10 ml_of 0.5 M H_2SO_4. The resulting solution is titrated to a starch endpoint with 39 mL of the thiosulfate solution. Calculate the weight percent of ascorbic acid in a tablet of Vitamin C from the following data: A 90 mg sample of a crushed Vitamin C tablet was dissolved in 40 mL of H_2SO_4 and 20 mL of water. Two grams of KI and 25 mL of 0.00860 M KIO_3 solution was added, and the mixture titrated to a starch endpoint. The titration required 10. mL of 0.0590 M thiosulfate solution.

Explanation / Answer

Ans 2- We have mass of KIO3 = 1.33 g

Molar mass of KIO3 = 39 + 126+3x16 = 214 g/mol

Volume of solution = 100 ml = 0.1 L ( 100/ 1000)

Molar concentration = moles of solute/ volume of solution in Litres

Moles of KIO3 = mass of KIO3/ Molar mass of KIO3

1.33 g/ 214 g /mol

= 0.006 Moles

Molar concentration( Molarity) = 0.006/ 0.1 = 0.06 mol/L

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