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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2C<br />
QUANTITATIVE AKALYSIS.<br />
Rcactio>is.--l^y precipitation we have:<br />
2MCSO. + N1I.,CI + 2NH,H0 + 2HNa,P0,=<br />
Mg.(NH.)J',0s + NH.Cl+2Na,S0, + 2H,a<br />
On heat<strong>in</strong>g we have :<br />
(NH,),Mg,P.O. = Mg,P,0, + 2NH, + M,0.<br />
<strong>The</strong>oretical Composition —<br />
MgO<br />
16.26<br />
sOj • 32.52<br />
7H,0<br />
5E-22<br />
100.00<br />
Amlfsis No. 3.—AMMONtA-I RON-Alum,<br />
Fe,(NHJ,(SOJ,+24H.O.<br />
A- — Determ<strong>in</strong>ation of Sulphuric Acid.<br />
Dissolve I gr. to 1.5 grms. <strong>in</strong> water, add 5 c.c, dilute<br />
HCl to prevent ferric hydrate from precipitat<strong>in</strong>g ^Vl^^i ''be<br />
BaSO.p heat to boil<strong>in</strong>g, add BaClj and proceed exsctlv ;s<br />
<strong>in</strong> <strong>Analysis</strong> 2, A.<br />
B.— Determ<strong>in</strong>ation of Ammonium,<br />
(Fres., § 99, b, 2, (-J.)<br />
(i.) Dry the salt, if necessary, before weigh<strong>in</strong>g, by press<br />
<strong>in</strong>g the powder between folds of bibulous paper. Diss'^lve<br />
about 1,5 grms. <strong>in</strong> a little cold water <strong>in</strong> a casserole, ac'd a<br />
little dilute HCl and an excess of PtCl,. Evaporate nearly<br />
to dryness on a water-bath scarcely heated to boil<strong>in</strong>g. Add<br />
01
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