Suppose you standardize a Na2S203 solution by dissolving 25.0 mg of KIO3 in acid and allow it to react with excess KI. The triiodide produced is then titrated with Na2S203 solution, requiring 30.00 mL to reach the starch/triiodide end point. Determine the molarity of the thiosulfate solution considering the following reaction: 103 +1 + H* → 13 + H20 2- + SO 2 3 2- →1 + $,°% 3 4 6

Suppose you standardize a Na2S203 solution by dissolving 25.0 mg of KIO3 in acid and allow it to react with excess KI. The triiodide produced is then titrated with Na2S203 solution, requiring 30.00 mL to reach the starch/triiodide end point. Determine the molarity of the thiosulfate solution considering the following reaction: 103 +1 + H* → 13 + H20 2- + SO 2 3 2- →1 + $,°% 3 4 6

Macroscale and Microscale Organic Experiments

7th Edition

ISBN:9781305577190

Author:Kenneth L. Williamson, Katherine M. Masters

Publisher:Kenneth L. Williamson, Katherine M. Masters

Chapter7: Extraction

Section: Chapter Questions

Problem 1Q

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Approximately 6 mL of concentrated perchloric acid (72%) was transferred to a bottle and diluted with about 1.0 L of water. A sample containing 250.0 mg of primary standard sodium tetraborate (Na2B4O7 .10H2O, FW= 381.42 g/mol) was dissolved in 50.00 mL water and required 27.25 mL of the HClO4 solution to reach the methyl red end point. A 25.00 mL solution of an unknown NH3 sample required 13.24 mL of the HClO4 solution. Calculate the molarity of the NH3? Use the factor label method in answering.
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Approximately 6 mL of concentrated perchloric acid (72%) was transferred to a bottle and diluted with about 1.0L of water. A sample containing 250.0 mg of primary standard sodium tetraborate (NazB407 .10H2O, FW= 381.42 g/mol) was dissolved in 50.00 mL water and required 27.25 mL of the HCIO4 solution to reach the methyl red end point. A 25.00 mL solution of an unknown NH3 sample required 13.24 mL of the HCIO4 solution. Calculate the molarity of the NH3.
An impure sample of Na3PO3 weighing 0.1 g is dissolved in 35 mL of water. A solution containing 45 mL of 3% w/v HgCl2, 30 mL of 10% w/v sodium acetate, and 10 mL of glacial acetic acid is then prepared. After digesting, filtering, and rinsing the precipitate, 0.2857 g of Hg2Cl2 is obtained. Report the purity of the original sample as % w/w Na3PO3.
When a Vitamin C (ascorbic acid; MM = 176.12 g mol-1) tablet is crushed, dissolved and titrated with 0.0340 M KIO3(aq) to a purple/blue endpoint (given by a starch indicator), the volume of KIO3 used is 29.80 mL. If 60 mg of ascorbic acid is the recommended dietary allowance (i.e., 100% of the RDA), then what is the % RDA for the Vitamin C in the tablet? KIO3(aq) + 5 KI + 6 H+ → 3 I2(aq) + 3 H2O I2 (aq) + ascorbic acid → 2 I- + dehydroascorbic acid
Oral rehydration salts are stated to contain the following components: Sodium Chloride 3.5g Potassium Chloride 1.5g Sodium Citrate 2.9g Anhydrous Glucose 20.0g 8.342 g of oral rehydration salts are dissolved in 500 ml of water. 5 ml of the solution is diluted to 100 ml and then 5 ml is taken from the diluted sample and is diluted to 100 ml. The sodium content of the sample is then determined by flame photometry. The sodium salts used to prepare the mixture were: Trisodium citrate hydrate (C6H5Na3O7, 2H2O) MW 294.1 and sodium chloride (NaCl) NW 58.5. Atomic weight of Na = 23. The content of Na in the diluted sample was determined to be 0.3210 mg/100 ml. Determine the % of stated content of Na in the sample. The stated should be 104.5, how??
Oral rehydration salts are stated to contain the following components: Sodium Chloride 3.5g Potassium Chloride 1.5g Sodium Citrate 2.9g Anhydrous Glucose 20.0g 8.342 g of oral rehydration salts are dissolved in 500 ml of water. 5 ml of the solution is diluted to 100 ml and then 5 ml is taken from the diluted sample and is diluted to 100 ml. The sodium content of the sample is then determined by flame photometry. The sodium salts used to prepare the mixture were: Trisodium citrate hydrate (C6H5Na3O7, 2H2O) MW 294.1 and sodium chloride (NaCl) NW 58.5. Atomic weight of Na = 23. The content of Na in the diluted sample was determined to be 0.3210 mg/100 ml. Determine the % of stated content of Na in the sample.
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What volume (whole number mL) of glycerol (SCE = 0.35, density = 1.25 g cm-3) are required to prepare 75 mL of a concentrated solution, which on dilution to 1.21 litres with water gives an isotonic lotion containing 0.26% w/v neomycin sulphate (SCE = 0.11)?
Calculate the amount of potassium chloride needed to prepare a 60 mL ORS based on the given procedure: Dissolve 0.25g NaCi, 0.20g NaHCO3, 0.35g KCI, and 1.5g of glucose in 100 ml distilled water using a 250 mL capacity beaker. (MW: Na: 23, K: 39, CI: 35, H: 1, C: 12, O: 16) 0.9 g O 0.12 g 0.15 g O 0.21 g
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