December 2011
Beginner
560 pages
12h 42m
English
Content preview from Basic Concepts of Inorganic Chemistry, 2nd Edition
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20
Analytical Chemistry (Salt Analysis)
Every salt contains a cation and an anion. The cation of a salt is called basic radical and the anion of a salt is called acid radical.
Table 20.1
| Salt | Cation or Basic radical | Anions or Acid radical |
|---|---|---|
NaCl |
Na+ |
Cl− |
BaSO4 |
Ba+2 |
SO4−2 |
The analysis is, therefore, performed in two steps:
- Tests for acid radicals.
- Tests for basic radicals
In practice, tests for acid radicals are carried out first and after that basic radical are tested.
TEST FOR ACiD RADICALS
It is carried out in two steps:
- Preliminary tests
- Solution tests
Preliminary tests
Acid radicals are conjugate bases of acids.
Table 20.2
| Acid | Acid radical |
|---|---|
H2SO4 |
HSO4− or SO4−2 |
HCl |
Cl− |
HNO3 |
NO3− |
H2S |
S−2 |
The test reagent is ...
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