CBSE Class 12 Chemistry Solutions Notes Set A

CBSE Class 12 Chemistry Revision Solutions. Learning the important concepts is very important for every student to get better marks in examinations. The concepts should be clear which will help in faster learning. The attached concepts will help the student to understand the chapter and score better marks in the examinations. 

Solution

KEY CONCEPTS

Solution is the homogeneous mixture of two or more substances in which the components are uniformly distributed into each other. The substances which make the solution are called components. Most of the solutions are binary i.e., consists of two components out of which one is solute and other is solvent. Ternary solution consists of three components

Solute - The component of solution which is present in smaller quantity.

Solvent The component of solution present in larger quantity or whose physical state is same as the physical state of resulting solution.

Types of solutions: Based on physical state of components solutions can be divided into 9 types.

Solubility - The amount of solute which can be dissolved in 100grm of solvent at particular temp. to make saturated solution.

Solid solutions are of 2 types -

1. Substitutional solid solution e.g. Brass (Components have almost similar size)

2. Interstitial solid solution e.g. steel (smaller component occupies the interstitial voids)

Expression of concentration of solution

1. Mass percentage= amount of solute present in 100grm solution.

Percentage = mass of solutionWB/ mass of solution(WA+WB)*100

For liquid solutions percentage by volume is expressed as = volume of solute(VB) / volume of solution (VA+VB)*100

2. Mole fraction it is the ratio of no. of one component to the total no. of moles of all components. It is expressed as ‘x’. For two component system made of A and B ,XA= nA +nB , XB= nA+nB , Sum of all the components is 1 ; XA+XB =1

3. Molarity (M)= No.of moles solute/ volume of solution(L)

It decreases with increase in temperature as volume of solution increases with temperature.

4. Molality (m) =  no of moles of solute/ mass of solution(in kg)

No effect of change of temperature on molality as it is mass to mass ratio.

5. Normality (N) = no.of gram equivalent of solute/ volume of solution(L) 

It changes with changes temperature.

6. Parts per million (ppm) concentration of very dilute solution is expressed in ppm.

Ppm =WB/WB+WA=106

Vapor pressure – It is defined as the pressure exerted by the vapour of liquid over the liquid over the liquid in equilibrium with liquid at particular temperature vapour pressure of liquid depends upon nature of liquid and temperature.

Roult’s Law –

1. For the solution containing non-volatile solute the vapor pressure of the solution is directly proportional to the mole fraction of solvent at particular temperature

PXA

PA = P0A.XA

2. For the solution consisting of two miscible and volatile liquids the partial vapor pressure of each component is directly proportional to its own mole fraction in the solution at particular temperature.

PA=P0A. XA ,   PB=P0B .XB

And total vapor pressure is equal to sum of partial pressure. Ptotal = PA + PB

Ideal solution The solution which obeys Roult’s law under all conditions of temperature and concentration and during the preparation of which there is no change in enthalpy and volume on mixing the component.

Please click the link below to download pdf file for CBSE Class 12 Chemistry-Alcohol, Phenol & Ether.

Tags: 

 


Click to View or Download pdf file
Click for more Chemistry Study Material

Latest NCERT & CBSE News

Read the latest news and announcements from NCERT and CBSE below. Important updates relating to your studies which will help you to keep yourself updated with latest happenings in school level education. Keep yourself updated with all latest news and also read articles from teachers which will help you to improve your studies, increase motivation level and promote faster learning

Checking of Boards Answer sheets starts today

CBSE has instructed almost 3000 schools to start the evaluation work for class 10th and class 12th board exam answer sheets from today. The checking of answer sheets for class 10th and class 12th was stopped earlier due to covid crisis in the country. Now in order to...

CBSE Board Exams in July Press Release

CBSE has released press note for the dates for the CBSE Board exams for Class 10. CBSE said “With regards to conduct of Class X examinations several queries are being received by the CBSE. In this context, it is once again reiterated that remaining examinations of...

CBSE Boards Paper Checking to Start

As per the announcement recently released by the Ministry of Home Affairs, at least 3000 CBSE affiliated selected as evaluation centers for board exam answer sheets will be allowed to open for the limited purpose of evaluation purposes only. The answer sheets for Board...

Class 10 Datesheet announced

CBSE has announced the date sheet for the remaining class 10 Board Exams, see dates below

CBSE Boards Answer Sheet Evaluation Class 10 and Class 12

HRD Minister Ramesh Pokhriyal, through a video conference with all the education ministers of the state, discussed the further steps to be taken to smoothen the education process during the Covid-19 lockdown. The most important topic which was discussed repeatedly on...

×
Studies Today