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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74<br />
QUANTITATIVE ANALYSIS.<br />
8KCIO3 + 6HNO3 = 2KCIO, + 6KNO3 + 6C1 + 130<br />
<strong>The</strong> action of hydrochloric acid on potassium chlorate is<br />
variously formulated; Bottger gives the equation (i) and<br />
Odl<strong>in</strong>g (2):<br />
( t ) 2KC10,+6Ha=::2Ka+Cl,03+4Cl+3H,0.<br />
(2) 4KC10,+ I2HC1=4KC1H-3C10,+9C1-|-6H,0.<br />
In any of these cases the powerful oxidiz<strong>in</strong>g agency of<br />
KClOj is evident.<br />
Appendix to Aimlysis No. 21.<br />
A.—Method for the Bstimaticn cf Fe and Ti only.<br />
Sample, pulverize, fuse i grm. ore with 3 grms. NaFl-)-i2<br />
fjrms. KHSO^. Dissolve <strong>in</strong> large quantity of cold water;<br />
if there is any considerable residue re-fuse. Neutralize<br />
with Na^COj until a slight precipitate forms, then add<br />
H,SO^ until the ppt. redissolves and the liquid is iilightly<br />
acid. Saturate with H^S gas, boil some hours, occa-<br />
sionally add<strong>in</strong>g H^S water. Filter from the precipitate<br />
of TiO,-j-S, dry, ignite, and weigh, if dark colored re-<br />
fuse, etc. To filtrate add a little KClOj, boil to oxidize<br />
lIjS. Reduce the iron with amalgamated z<strong>in</strong>c and plat<strong>in</strong>um<br />
foil, and titrate with KiMn^Oj as usual. As a result<br />
of the fusion we have<br />
4NaFl+SiO.+4H^SO^==4NaHSO^-fSiFl,+2fI,0.
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