The Students' Guide in Quantitative Analysis - Free Ebooks Library

34
QUANTITATIVE ANALYSTS.
N.B.—Make a strong hot solution of CuS0,,-t-.5H,0, add
pieces of pumice-stone, boil hard, evaporate to dryness and
ignite well. The product should be nearly white.
g contains in outer tube, soda-lime ; in inner tube, {k\
pumice-stone saturated with II^SO^ ;
both before the absorption and after.
Fig. 4.
weigh these together
Place i.o to 1.5 grms. mineral in c, weigh g and h, and
connect apparatus ; a is not attached at first. Pour a little
water through the funnel tube into c, then add gradually
HCl, diluted one-half with water. Attach a, and aspirate
gently. Heat cautiously to incipient ebullition ; maintain
this a few moments, and let cool while the aspiration
continues. Weigh — increase of weight gives CO^.
Note 9, Calculation.—Normal dolomite contains ;
30.4 per cent. CaO.
47.8 " CO.
21.8 MgO.
100.0
Having estimated these constituents, calculate the