quise2ross
29.02.2020 •
Chemistry
Calculate the weight percent of ascorbic acid in a tablet of Vitamin C from the following data:A 80 mg sample of a crushed Vitamin C tablet was dissolved in 40 mL of H2SO4 and 20 mL of water. Two grams of KI and 40. mL of 0.00653 M KIO3 solution was added, and the mixture titrated to a starch endpoint. The titration required 15 mL of 0.0510 M thiosulfate solution. I know the answer is 88%, but how did they get it?
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Ответ:
The Answer is 88%
Explanation:
The balanced ionic equation of the reaction
Looking at the above reactions
The original number of moles of = 3 × number of moles of
= 3 × volume × concentration of
Note: The formula for number of moles is volume × concentration
mol
The number of moles of left after its reaction with ascorbic acid
= x moles of
= x volume x concentration of
Note: The division by 1000 is to convert mill liter to liter
Moles of ascorbic acid = moles of reacted
Hence
Mass of ascorbic acid = moles of ascorbic acid × molar mass of ascorbic acid
Weight% of ascorbic acid = mass of ascorbic acid/mass of sample x 100%
= 70.55/80 × 100%
= 88.1%
Ответ:
Electron is subatomic particles whose electric charge is negative one elementary charge (-1). Molecule who capture electrons now how more electrons than protons (one positive charge) and because of that that molecule is negative.