An Introductory Course of Quantitative Chemical AnalysisHenry P. TalbotThe Project Gutenberg EBook of An Introductory Course of QuantitativeChemical Analysis by !enry P" TalbotThis eBook is for the use of anyone any#here at no cost and #ithalmost no restrictions #hatsoever"$ou may co%y it give it a#ay orre&use it under the terms of the Project Gutenberg 'icense included#ith this eBook or online at ###"gutenberg"netTitle( An Introductory Course of Quantitative Chemical Analysis )ith E*%lanatory +otesAuthor( !enry P" Talbot,elease -ate( .une /0 1002 3EBook 4516768'anguage( EnglishCharacter set encoding( A9CII::: 9TA,T ;< T!I9 P,;.ECT G=TE+BE,G EB;;> Q=A+TITATI?E C!E@ICA' A+A'$9I9 :Produced by >evin !andy -ave @addock .ose%hine Paolucci and the;nline -istributed Proofreading Team"3TranscriberAs notes( In the chemical eBuations su%erscri%ts areindicated #ith a C and subscri%ts are indicated #ith a D" The affecteditem is enclosed in curly brackets EF" E*am%les are !CEGF for hydrogenion and !DE1F; for #ater" 9ince the underscore is already being usedin this %roject italics are designated by an e*clamation %ointbefore and after the italiciHed #ord or %hrase"8A+ I+T,;-=CT;,$ C;=,9E;A'I+E 9T,E+GT! ;< 9;-A A9!-ETE,@I+ATI;+ ;< ACI- 9T,E+GT! ;< ;IA'IC ACI-MII" ;*idation ProcessesMGE+E,A' -I9C=99I;+BIC!,;@ATE P,;CE99 +;DE/F G IDE1F"T#o methods for the direct standardiHation of the sodium thiosul%hatesolution are here described and one for the direct standardiHation ofthe iodine solution"M@ethod AMP,;CE-=,E"&&)eigh out into Q00 cc" beakers t#o %ortions of about0"5Q0&0"56Q gram of %otassium bromate" -issolve each of these in Q0cc" of #ater and add 50 cc" of a %otassium iodide solution containing/ grams of the salt in that volume K+ote 5L" Add to the mi*ture 50 cc"of dilute sul%huric acid K5 volume of sul%huric acid #ith Q volumes of#aterL allo# the solution to stand for three minutes and dilute to5Q0 cc" K+ote 1L" ,un in thiosul%hate solution from a burette untilthe color of the liberated iodine is nearly destroyed and then add 5cc" or 1 cc" of starch solution titrate to the disa%%earance of theiodo&starch blue and finally add iodine solution until the coloris just restored" @ake a blank test for the amount of thiosul%hatesolution reBuired to react #ith the iodine liberated by the iodate#hich is generally %resent in the %otassium iodide solution anddeduct this from the total volume used in the titration"AlK9;DE2FLDE1F"51!DE1F;LY )hat #ill be the #eight of the ignited%reci%itateYMAns#ersM( 1"1R cc"J 0"15Q2 gram"70" )hat volume of nitric acid Ks%" gr" 5"0Q containing N"0X!+;DE/F by #eightL is reBuired to o*idiHe the iron in one gram of