Avogadro’s number helps in many numerical calculations. Here, we will discuss the important relationships in the mole concept. Avogadro’s number may be defined as the number of atoms present in one gram atom of the element. It is also equal to the number of molecules present in one gram molecule of the substance. 1 mole […]
What are the different laws of chemical combination ? We study the different aspects of chemical reactions in the various chemical combinations. Law of conservation of mass : Laws of chemical combination In all physical and chemical changes, total mass of the system remains constant. It means matter is neither created nor destroyed. Physical changes […]
Significant figures is the total number of digits in a number . Here, are some rules for finding the value of significant figures. Rules for determining significant figures in addition and subtraction Here is the rule of finding the result of addition and subtraction. It should have the same number of decimal places as the […]
Sodium hydroxide, NaOH has the common name of caustic soda. Here, we will study about the preparation, properties and uses of sodium hydroxide, (Caustic soda) Introduction of Sodium Hydroxide (Caustic Soda), NaOH Preparation of NaOH by Castner-Keller cell There is a large rectangular iron tank. Ionisation of NaCl takes place on passing electricity through it. […]
Calcium sulphate hemihydrate is Plaster of Paris. The formula of Plaster of Paris is CaSO4.1/2H2O. Here, we will study about the preparation, properties and uses of Plaster of Paris, CaSO4.1/2H2O Preparation of Plaster of Paris, CaSO4.1/2H2O Heating Calcium sulphate hemihydrate to 393K forms Plaster of Paris. 2 CaSO4.H2O + 393 K ………………….> 2CaSO4.1/2H2O + 3H2O […]
Introduction Common name of CaCO3 is Limestone. Calcium carbonate occur as calcite, marble, chalk etc. Here, we will study about the preparation, properties and uses of calcium carbonate, CaCO3 Preparation of Calcium carbonate, CaCO3 We can prepare CaCO3 by the following methods : Calcium carbonate preparation from slaked lime : Limestone (CaCO3) forms when CO2 […]
We will study here about the preparation, properties and uses of Sodium Carbonate. Chemical formula of washing soda is Na2CO3.10H2O Preparation of Sodium Carbonate In Solvay Ammonia Process firstly, CO2 is passed through brine solution saturated with NH3 NH3 + H2O ……………………..> NH4+ + OH- Na+ + Cl- + NH4+ + OH- + CO2 ……………………> […]
Calcium hydroxide Ca(OH)2 is the chemical formula of slaked lime. Here, in this article you will study about the preparation, properties, chemical reactions and uses of Ca(OH)2 Preparation reactions of Calcium hydroxide Ca(OH)2, slaked lime Slaked lime is sparingly soluble in water. The solubility of slaked lime decreases with rise in temperature. There are various […]
Calcium oxide also commonly known as quick lime is one of the most important compounds of calcium. Here, we will study about the preparation, physical and chemical properties and uses of calcium oxide CaO, Quick lime. Preparation of Calcium oxide (CaO), Quick lime Calcium oxide has Chemical formula CaO. Common name of calcium oxide (CaO) […]
According to Henry’s Law, mass of the gas dissolved in a given volume of a liquid is directly proportional to the pressure of the gas. This is called Henrys law in solutions Solubility of O2 gas of the air in water is called dissolution of O2 which forms the basis of survival of aquatic life. […]
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