Soul of Chemistry

Difference between Strength and Mole fraction Expressing the Concentration of a Solution:           T he amount of solute present in a given quantity of solution or dissolved in a given amount of solvent is called the concentration of a solution . Depending on the units of the solute and solvents taken, the concentrations of a solution can be expressed in many ways. Strength (s): It is defined as the amount of solute in gram dissolved per litre of solution. S = (weight of solute in gram/ volume of solution in ml) X 1000. For example if 4gm urea is dissolved in 500 ml then strength of the solution, s = (4/500) x 1000 = 8 g/ltr Mole fraction (X): Mole fraction of a component in a solution is defined as the ratio of moles of that component to the total number of moles of all the components present in the solution. In a binary solution, if n 1 is the numbers of moles of solvent and n 2 is the numbers of moles of solute then,       X solvent = n 1 / (n 1 + n 2 )              

Application of Le Chatelier's Principle to physical change      Le Chatelier's principle says that when a reversible process in equilibrium is subjected to any change in pressure temperature or concentration then the equilibrium shifts in such direction that the effect of change is compensated.      This principle can be applied bot to the physical or chemical change. At first we will discuss about physical equilibrium and then the chemical equilibrium.   Application to Physical Equilibrium:      Let us apply the principle to a solid liquid equilibrium of water.                                Solid Ice    ⇌  Liquid Water      As we know when a definite volume of water is converted into ice, the volume of ice becomes greater than that of liquid water. This is because of the cage like structure in ice due to inter molecular hydrogen bonds between water molecules.   For your particular interest, we will discuss why the ice in Himalayan mountains becomes harder and harder as we go

 Concepts of chemical equilibrium greatly expected  to be asked in JEE Main As the JEE Main grows older, it asks more and more tricky questions. To be able to solve chemistry questions asked in JEE Main, one must get all important concepts cleared and  analyse previous year question papers. The ability to grasp the data given in the question and find appropriate formula or path to find the answer is frankly achieved through problem solving. The level of questions asked in JEE Main is the next important thing to realise. Here are the summary of concepts and questions asked from chemical equilibrium in the previous years, so that it will be easy to take a conclusion. (Though you will find little easier questions asked in 2020 due to corona pandemic...) Rate vs. Time graph w.r.t. Equilibrium: 1.  Q: (04/09/20 Morning)  For the equilibrium A  ⇌  B, the variation of the rate of the forward reaction (a) and reverse reaction (b) with time is given by: Solution:  Characteristics of chemical eq