Title SALT ANALYSIS.pdf ✅

Salt Analysis DEFINITION The branch of chemical analysis which aims to find out the constituents of a mixture of compound is known as Qualitative Analysis. The Identification of a substances usually involves its conversion into a new substance possessing characteristic properties with the help of one or more substance of known composition. The Substance which is used to bring about such change is called a Reagent. ANALYSIS OF ACIDIC RADICAL Classification of Acidic Radical • CO2 is colourless, odourless gas evolved with brisk effevescence, Detected by lime water test. • SO2 is colourless, Suffocating gas with burning sulphur odour. Detected by lime water test or by passing in Cr2O7 2−/H +solution. • H2 S is a colourless gas having rotten egg odour. • CH3COOH has colourless fumes having vinegar odour. • NO2/Br2 is brown gas. • I2 is violet gas.
LIME WATER / BARYTA WATER TEST When CO2 is passed in lime water or baryta water then white turbidity (milky appearance) is formed due to the formation of soluble carbonate but when excess of CO2 is passed then white turbidity disappeared due to formation of soluble bicarbonate. ACIDIC RADICAL TABLE dil. H2SO4 Conc. H2SO4 Cacl2 BaCl2 HgCl2 AgNO3 Pb(OAc)2MnO4 − /H+ CO3 2− CO2 ↑ CO2 ↑ CaCO3 ↓ white BaCO3 ↓ white HgCO3. 3HgO ↓ Reddish brown Ag2CO3 ↓ PbCO3. 2 Pb(OH)2 ↓ - HCO3 − + Δ CO2 ↑ CO2 ↑ CaCO3 ↓ BaCO3 ↓ HgCO3. 3HgO ↓ Reddish brown Ag2CO3 ↓ PbCO3. 2 Pb(OH)2 ↓ - SO3 2− SO2 ↑ SO2 ↑ CaSO3 ↓ white BaSO3 ↓ white - Ag2SO3 ↓ white PbSO3 ↓ white SO4 2− S2O3 2− SO2 ↑ +S ↓ SO2 ↑ - BaS2O3 ↓ white HgS2O2 ↓ white Ag2 S2O3 ↓ white PbS2O3 ↓ white SO4 2− + S ↓ S 2− H2 S ↑ S ↓ +SO2 ↑ - BaS ↓ black HgS ↓ black Ag2 S ↓ black PbS ↓ black S ↓ NO2 − NO2 ↑ NO2 ↑ - - - AgNO2 ↓ - NO3 − CH3COO−CH3COOH ↑ CH3COOH + SO2 ↑ - - - - - - I I2 ↑ violet - - HgI2 ↓ scarlet red AgI ↓ yellow PbCl2 ↓ dark yellow I2 ↑ Cl− HCl ↑ - - - AgCl ↓ white PbCl2 ↓ white Cl2 ↑ Br− Br2 ↑ brown - - - AgBr ↓ pale yellow PbBr2 ↓ white Br2 ↑ C2O4 2− - CO2 ↑ +CO ↑ CaC2O4 ↓ white BaC2O4 ↓ white - Ag2C2O4 ↓ white - CO2 ↑