Simple Qualitative Analysis

Simple qualitative analysis involves the identification of the constituents of an inorganic substance or a mixture of substances. The inorganic substances are split-up into two types of charged particles one of which is positively charged and the other is negatively charged. The charged particles are called ions or radicals. The positively charged ions are called cation or basic radical. The negatively charged ion is called anion or acid radical.
In the qualitative analysis of an inorganic substance number of tests are carried out in order to discover the acidic and basic radical present in it. A test is an experiment along with an observation made to show the presence or absence of a certain substance or class of substances. In the test we note the formation or disappearance of
(I) a colour or (ii) a precipitate or (iii)a gas (iv) an odour
The test may be positive or negative. A positive test is one that gives the result indicated in the procedure and shows the presence of the particular radical. A negative test is one which does not give the indicated results and shows the absence of the particular radical. The substances or solutions added to bring about the reactions are called reagents. http://www.tndte.com/TEXT%20BOOKS/Book-Unit%20wise/Engineering%20Chemistry-I%20&%20II/Chem_First%20Sem-II%20-%20Practical.pdf Topic : Qualitative analysis.

Purpose : To determine the cations and anions in a mixture of inorganic salts.

Theory : Cations and anions of unknown inorganic substances can be determined

through qualitative analysis.

Materials : KA 1 and KA 2 solutions, distilled water, aqueous sodium

hydroxide, aqueous potassium iodide, aqueous potassium chromate(VI),

aqueous sodium ethanoate, aqueous sodium carbonate, dilute sulphuric

acid, iron(II) sulphate, concentrated sulphuric acid, dilute nitric acid,

lead(II) nitrate solution, Alloy Devordas.