Chemistry Practicals Class 12
Preparation of Inorganic Compounds
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- Preparation of inorganic compounds is one of the important class 12 chemistry practicals.
- You will understand the terms - inorganic compounds, double salts and coordination compounds.
- You will acquire the skills to prepare Mohr’s salt, Potash alum and Potassium trioxalatoferrate.
- You will learn the chemicals and apparatus required to prepare Mohr’s salt, potash alum and potassium trioxalatoferrate.
- Once you understand the concept of the experiment, you can perform the preparation of inorganic compounds practical in the real lab more accurately and quickly.
Inorganic compounds are substances that do not come from living things. They are formed by non-living natural processes or by laboratory preparation methods. These compounds are found in nature in the form of minerals.
The two important classes of inorganic compounds are
1) Coordination compounds 2) Double salt
(1) Coordination compounds: A chemical compound in which the central ion or atom (or the coordination centre) is bound to a fixed number of atoms, molecules or ions is called a coordination compound. Central metal atom accepts electron pairs from the ligands, or ligands donate electrons to the central metal atom to form a coordinate bond.
The number of ligands directly bonded to the central metal atom is called the coordination number of a complex. Alfred Werner has proposed the structure of complex compounds. He proposed the concept of primary valency, which is satisfied by the central ions and secondary valency, that are satisfied by the ligands.
(2) Double salt: Double salt is a compound that is formed by the combination of two different salt compounds. The two salts crystallize together to form a single substance, but it ionizes as two distinct salts when dissolved in water. Its properties are completely different from its component single salt. For example, potassium aluminium sulphate or potash alum [K2SO4. Al2(SO4)3]. It is also known as Fitkari. It contains two different cations K+ and Al3+. It is a colourless, crystalline solid with a sour taste.
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Requirements for this Science Experiment
⦁ Beaker ⦁ China Dish (Evaporating Dish) ⦁ Funnel ⦁ Glass Rod ⦁ Tripod Stand ⦁ Bunsen Burner ⦁ Wire Gauze ⦁ Wash Bottle ⦁ Measuring Cylinder ⦁ Electronic Balance ⦁ Burette Stand With Clamp ⦁ Crystallization Dish ⦁ Filter Papers ⦁ Watch Glass ⦁ Butter Paper ⦁ Sand Bath ⦁ Black Paper ⦁ Vacuum Filtration Assembly