ji :. 



It will !. inferred thai t he react i..n proceeded tocarUn dioxid. lut was not com- 

 plete when lari:' amounts of methyl alcohol were oxidi/ed. There is no need of 

 cooling th- solutions if complete oxidation is intended, so a scries of trials wen- made 

 in temperature, time of oxidation thirty minutes, and using the factor 0.1686. 

 The results follow: 



xit'nm "f ,,nth til alcohol by alknl'inr /Mrmnnyanatf nt room tfin jurat aw. 



When warmed in a water l>aih af t'4) for five minutes and eooled to room tempera- 

 ture and titrated, ().(>:;!:; -ram of methyl aleohol U M\,- i (i.; ( i:> ,,r KMl.s percent of the 

 amount pr- 



I-'or the appli< ai i'u of I he alkaline perinanu'anale met In x I to the < arhon tetraehlorid 

 I of the higher al- oh,,U from di-tilled li|iiors, the following pn.<-edure is su- 



>..ii ii.. 



I. A .-iroriir'T -oluiion of pota ium pern nitainini: appn.\imai. 



^ram- to the liter 



\ hydrogen peroxid solution .,f a -rren-th sliu'lnlx in e\e.-ss of thai of solution 



V standard permanganate nolut ion containing I" ill to the liter, 



the \aliie of which has l>een accur 'laltied 



I \ -oluiion of [...lassium h\dro\id"of 1 : I strength. 



\ -ulphuri. a. id solut ion' containing ap|n\iinaiel\ j.'i p,-r c.-nl of arid. 



v i i; 



he . arl.on teirarhlorid niain'd in I he separatorv funnel, add Ml cc 



of ih. :i h\dro\id ,-oluiion \o I < IM,| i he mixt ure in i<e \\ater to approxi- 



mate!) ( < Similarly cool KM) cc of the -t n.n-er soluiion of jiotas.-iiiin |.erman-anale 

 iiratel\ ni.-a-ured, in a flask. 



hr ronirnt- "I the .-eparatory funnel add the l>ulk of the permanganate .-oliition, 

 l.ut without rinsing the tla.-k and retaining the n-.-idiir- lo I.e added ai a latersia^'. 



:io\e the mi \t ure from the l.ath and -hake \ i'joriu-l\ f<>r a |eriiKl of li\e minute-; 

 set aside for tliirty nunute<. with occasional .-hakinu', permiitinu r the Injuid to warm 



to room temperature - ('.). 



urately niea.-iiro 100 re of hydrogen pep.\id -olution into a 1-liter lOrlenmeyer 

 lla.-k. A- idulate tliis with KM) .-I- of sulphuric-acid solution. Slowly add the c,~>n- 

 lents of the separator}' funnel with on.-iani -hakini:. keepin- the arid H.lulion -n- 

 .-tant 1\ in '-veSB. 



Kin-e the M -parafory funnel and flask containing ihe residue of permanganate with 

 water and add to the peroxid solution. 



Titrate the excess of hydrogen peroxid remaining with the standard potassium per- 

 man-anate. 



Run a blank determination, IHUIL: 'he same amounts of the stronger permanganate, 

 -ium hydrate, hydrogen peroxid, and sulphuric-acid solution and titrating tin; 

 rer-idtial poroxid with ! he standard perman-janate as before. 



The difference in amount ol permanganate consumed in grams lim< - 0.606 

 the result in terms ot aim 1 alcohol. 



