The Students' Guide in Quantitative Analysis - Free Ebooks Library
The Students' Guide in Quantitative Analysis - Free Ebooks Library
The Students' Guide in Quantitative Analysis - Free Ebooks Library
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120 QUANTITATIVE ANALYSIS.<br />
brown when heated with a strong solution of sodic hy-<br />
drate. It dissolves <strong>in</strong> cold cone. H,SO, without be<strong>in</strong>r/<br />
blackened. [Cane sugar blackens.]<br />
If a cone, solntion of glucose is mixed with cobaltic<br />
nitrate, and a small quantity of fused NaHO, the solution<br />
rema<strong>in</strong>s clear on be<strong>in</strong>g boiled ; if very concentrated it de-<br />
posits a light-brown ppt.<br />
[Cane sugar solutions similarly treated give a violet ppt '<br />
which turns green on stand<strong>in</strong>g].<br />
BaH.O. added to an alcoholic solution of glucose forms<br />
a white ppt.<br />
If a little caustic soda is added to a solution of glucose<br />
and hen drop by drop a dilute solution of CuSO, a deep<br />
b ue hciuKi fonns ; after some time <strong>in</strong> the cold, b 't imme-<br />
teetcd ,,^^'^^^ I °' S^^^^se may be easily decZ'-<br />
^^"^^^^^^.'''" S'^'^^ ^ '-eel t<strong>in</strong>t to the solution<br />
Cupnc acetate is similarly reduced Pot-i.^Jn ,..\ c<br />
copper acts likewise.<br />
^oZ ^tXZ::T'''- '<br />
otassio-tartrate of<br />
^^- ^^"-e w<strong>in</strong> n<br />
.educe<br />
"I i-upnc oxicie to cuprous oxide.<br />
Preparation of FcIU<strong>in</strong>g^s Solution.<br />
Dissolve exactly u6-n orm. , ^<br />
200 c. c. water I^ atntlf ^<br />
T'*" ^'^ ^^'^O, <strong>in</strong> about<br />
Rochelle salts (CHK NO ^"""^ '"'°''' ''^ S''^'- "^ P"<br />
-Hydrate :^f^^:^f^^-f^ ^ ^ P-e sodi-<br />
^34639 grms. CnSO. and corre-<br />
^Ponds to<br />
0.0S0 ! ,<br />
d-k- On boil<strong>in</strong>g ;th TuitT f '"'"^- ^^^^ - ^^^<br />
"o '^°^'precipitate.<br />
°^ ^^^^er, it should give
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