In the Vitamin C analysis, you determined Vitamin C content in a tablet using redox titration method. Calculate the mass of vitamin C in the tablet which was dissolved in 50 mL of water. A 25 mL aliquot of this stock solution was titrated with 18.5 mL of a 0.0250 M KIO3 to the blue starch end point. If the same KIO3 solution was used to titrate 20 mL of a commercial juice blend and the juice blend required 1.5 mL of KIO3 to reach the end point. How many milligrams of vitamin C are in the sample of juice blend? Molar mass Vitamin C= 176.16 g/ml.

A solution of sodium thiosulfate was standardized by dissolving 0.1210 g KIO3 (MM=214) in water, adding a large excess of KI, and acidifying with HCI. The liberated iodine required 41.64 mL of the thiosulfate to decolorize the starch/iodine complex. Calculate the molarity of the Na₂S₂O3.     0.0721 M     0.239 M     0.1234 M     0.0815 M

Molecular Weights: -Cu 63.546g/mol A rock was analyzed for its copper content. Since copper goes through redox reactions, an iodometric totration was utilized. An unknown 1.5098 g sample was acidified using 3M sulfuric acid to dissolve the Cu compounds and diluted w/ 30mL distilled water. Kl was then added resulting in 12 and Cul precipitate from Cu²+ (first reaction). I₂ then reacted with excess Ki resulting in 13 (second reaction) w/c was titrated with Na2S203 (third reaction). 17.600mL of the titrant was required in the solution to reach the starch end point. Before the the sample was titrated, the titrant was standardized by taking 50mL of 6.786e-3 standard KIO3 sol'n, acidifying and adding KI crystals. 9.8mL was required for the titration of this solution to reach starch endpoint. a. Give the concentration (M) of S₂O3² titrant. b. Give the copper content of the rock (%w/w). wwwwwww....

A 0.1093-g sample of impure Na2CO3( Molecular weight 106) was analyzed by the Volhard method. After adding 50.00 mL of 0.06911 M AGN03 (Molecular weight 169.87), the sample was back titrated with 0.05781 M KSCN, requiring 27.36 mL to reach the end point. Report the purity of the Na2CO3 sample.