The Students' Guide in Quantitative Analysis - Free Ebooks Library

KEI'ORXJjNG ANALYSES.
E. Reporting Analyses.—
Analyses may be reported on blank forms printed on let-
ter paper 8" x lo", having following headings :
.
GRAMMES
These
Hakti'okd, , !S8 . Report of
OF . DliXEKMlNATJON OF .
. Metiiod of Analysis ,
Analysis
TAKEN
headings are
printed in vertical colimin ; in one horizontal line
are placed following headings: Pkecii'ITATes, Actual
Weights, Constituents, Calculated Weights, Per-
centages, Theoretical Percentages; under each a blank
space is left of 2 1-2 inches. Under "precipitates" place
formulas of precipitates obtained; under "actual weights"
place actual weighL-i of precipitates; under "constituents "
place forniDlcC of constituents to be reported; under "cal-
culated weights ' place the amounts of constituents existing
in precipitates; under " percentages" place percentages of
constituents actually obtained — in short, the results of
analyses. The last column, "theoretical percentages," can
be fdled only in the case of few pure chemical salts.
The words special remarks are printed about two inches
from the bottom of the sheet, leaving room for remarks on
processes employed, etc.*
Notes to the Analysis of Barium Chloride,
Reactions. (I) BaCL -f H,SO, = EaSO, + 2HCI
(2) BaCI, -\- -AgNO^ = 2AgCl+ Ba(NO,),.
The chloride of silver precipitate changes color on expos-
ure to light, losing chlorine and forming AgjCl ; the change,
however, is only superficial, but Mulder says the loss of
weight is appreciable.
* Sec scccimcs blaok ai the end of this beok.