Learning Materials
Features
Discover
Chapter 16: Q10P (page 391)
What is a Jones reductor and what is it used for?
Jones reductor is a reducing substance that can be used to lower the oxidation state of a metal ion in an aqueous solution
Over 30 million students worldwide already upgrade their learning with 91影视!
All the tools & learning materials you need for study success - in one app.
Get started for free
Here is a description of an analytical procedure for superconductors containing unknown quantities of Cu(I),Cu(II), Cu(III), and peroxide : 33The possible trivalent copper and/or peroxide type oxygen are reduced by Cu(I) when dissolving the sample (ca .50 mg) in deoxygenated HCl solution ( 1 M) containing a known excess of monovalent copper ions (ca.25mgCuCI) . On the other hand, if the sample itself contained monovalent copper, the amount of Cu(I) in the solution would increase upon dissolving the sample. The excess Cu(I) was then determined by coulometric back titration... in an argon atmosphere." The abbreviation "ca." means "approximately." Coulometry is an electrochemical method in which the electrons liberated in the reactionare measured from the charge flowing through an electrode. Explain with your own words and equations how this analysis works.
Aqueous glycerol solution weighing 100.0m gwas treated with 50.0 mL of 0.083 7 M in 4 MHCIat for15minto oxidize glycerol to formic acid.
Glycerol Formic acid
FM92.095
The excess required 12.11mL of 0.044 8 MFto reach a ferroin end point. Find wt%glycerol in the unknown.
The Kjeldahl analysis in Section 11-8 is used to measure the nitrogen content of organic compounds, which are digested in boiling sulfuric acid to decompose to ammonia, which, in turn, is distilled into standard acid. The remaining acid is then back-titrated with base. Kjeldahl himself had difficulty in 1880 discerning by lamplight the methyl red indicator end point in the back titration. He could have refrained from working at night, but instead he chose to complete the analysis differently. After distilling the ammonia into standard sulfuric acid, he added a mixture of and KI to the acid. The liberated iodine was then titrated with thiosulfate, using starch for easy end-point detection even by lamplight. Explain how the thiosulfate titration is related to the nitrogen content of the unknown. Derive a relationship between moles of liberated in the digestion and moles of thiosulfate required for titration of iodine.
Two possible reactions of withto produceandare
Scheme:
Scheme:
(a) Complete the half reactions for both schemes by adding and and write a balanced net equation for each scheme.
(b) Sodium peroxyborate tetrahydrate, produces when dissolved in acid . To decide whether Scheme 1 or 2 Schemeoccurs student at the U.S. Naval academy weighed into a 100mLvolumetric flask added 20mLof and diluted to the mark with . Then they titratedof this solution withuntil the first pale pink color persisted. How may mL ofare required in Scheme 1and 2 Scheme?
(The Scheme 1stoichiometry was observed).
Consider the titration of 100.0mLof in by to give and , using Pt and saturated Ag | AgCl electrodes to find the end point.
(a) Write a balanced titration reaction.
(b) Write two different half-reactions for the indicator electrode.
(c) Write two different Nernst equations for the cell voltage.
(d) Calculate Eat the following volumes of and 50.0 mL. Sketch the titration curve.
What do you think about this solution?
We value your feedback to improve our textbook solutions.
Explanations 
Textbooks 
Flashcards 
91影视 AI 
Notes 
Study Plans 
Study Sets 
Find a degree 
Magazine