Category: Practical

Reaction of Manganese, Mn2+ Color : pale pink, almost colourless Test Observations Notes Add NaOH(aq) An off-white ppt

Reaction of Cr3+ Its colour is green. A solution of Cr3+ is commonly provided in form of CrCl3(aq).

Reaction of iron(ii), Fe2+ Colour : pale green, almost colourless. Test Observation Notes Add H2O2   Then add

Reaction of Copper, Cu2+ Cu2+(aq) (pale blue) 1ons can be obtained b Dissolving a solub1e copper (II) salt

Qualitative Analysis Invariably involves detection or identification of cation(s) and or anion(s) present in given test substance in

Reducing Agents Commonly used reducing agents include; KI-iodides; Sodium thiosulphate -thiosulphate ions Potassium Iodide, KI I–(aq) is oxidized

Oxidizing Agents Common used oxidizing agents include; KMnO4 K2CrO7 H2O2 *usually requires acidic conditions eg adding sulphuric acid

Common Reagents and their uses The commonly used reagents dilute NaOH HCl(aq) dilute H2SO4 KI(aq) K2Cr2O7(aq) BaCl(aq) NaHCO3(solid