Instruction: Show your solutions. Observe significant figures.1. The thiourea in a 1.455 g sample of an organic material was extracted into a dilute H2SO,solution and titrated with 37.31 mL of 0.009372 M Hg²* via the reaction below.4(NH2)2CS + Hg² [(NH2)>CS]«Hg²•What is the percentage of (NH2)2CS in the sample?2. A 0.4912-g sample of a petroleum product was burned in a tube furnace, and the SO2produced was collected in H2O2.SO2@) + H2O2 - H2SO4A 25.00-mL portion of 0.00873 M NAOH was introduced into the solution of H2SO4, followingwhich the excess base was back-titrated with 15.17 mL of 0.01102 M HCI. Calculate the sulfurconcentration in parts per million.3. A 100.0 mL sample of ground water was treated to convert the iron present to Fe2. Additionof 25.00 mL of 0.002412 M K2Cr2O7 resulted in the reaction below.6FE2+ + Cr2O,2+ 14H* → 6FE3+ + 2Cr³+ + 7H;OThe excess K2Cr2O7 was back-titrated with 8.12 mL of 0.00859 M Fe2• solution. What is theconcentration of Fe in the sample in parts per million?4. A 10.00 mL portion of an HCI solution required 11.01 mL of 0.09883 M NAOH to reach an endpoint with phenolphthalein.HCI + NaOH –→ NaCI + H2OCalculate the molar concentration of HCI.5. Describe the preparation of 2.50 L of 0.500 M HCIO4, starting with a 9.00 M solution of thereagent.

1. The thiourea in a 1.455 g sample of an organic material was extracted into a dilute H2SO, solution and titrated with 37.31 mL of 0.009372 M Hg²* via the reaction below. 4(NH2)2CS + Hg2 - [(NH2)2CS]«Hg² What is the percentage of (NH2)2CS in the sample?

1. The thiourea in a 1.455 g sample of an organic material was extracted into a dilute H2SO, solution and titrated with 37.31 mL of 0.009372 M Hg²* via the reaction below. 4(NH2)2CS + Hg2 - [(NH2)2CS]«Hg² What is the percentage of (NH2)2CS in the sample?

Appl Of Ms Excel In Analytical Chemistry

2nd Edition

ISBN:9781285686691

Author:Crouch

Publisher:Crouch

Chapter10: Potentiometry And Redox Titrations

Section: Chapter Questions

Problem 8P

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The thiourea in a 1.455 g sample of organic material was extracted into a dilute sulfuric acid solution and titrated with 37.31 mL of 0.009372 M Hg2+ via reaction: 4(NH2)2CS + Hg2+ →[(NH2)2CS]4 Hg2+ P.S. Answer only the last two letters of the following questions. (Only C and D) a. Is this an example of total analysis technique or concentration technique? Explain. b. Calculate the percent (NH2)2CS ( 76.12 g/mol) in the sample. c. What is classification of the analysis based on the amount of sample and amount of analytes present? Explain. d. If the true value is 10.00%, calculate the absolute and relative error.
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The thiourea in a 1.455-g sample of organic material was extracted into a dilute H2SO4 solution and titrated with 37.31 mL of 0.009372 M Hg2+ via the reaction below. Find the percentage of (NH2)2CS (76.12 g/mol) in the sample. 4(NH2)2CS + Hg2+= (NH2)2CS 4Hg2+