Chemistry · Class 12 · Chapter 1
Solutions
10 lessons96 min4 simulations10 practice questions
This chapter is about homogeneous mixtures, mostly liquid ones: how their composition is stated, how much gas or solid a liquid can hold, and how a dissolved substance changes the vapour pressure of a liquid. From that single change come the four colligative properties, which count solute particles and so give molar masses, and the van't Hoff factor, which corrects them when solutes split into ions or pair up.
Also called: colligative properties · Raoult's law · osmotic pressure
Lessons
10 lessons · 96 min
01Types of solutions and concentrationNCERT §1.1; §1.28 min02Solubility and Henry's lawNCERT §1.39 min03Vapour pressure and Raoult's lawNCERT §1.410 min1 sim04Ideal and non-ideal solutionsNCERT §1.59 min1 sim05Relative lowering of vapour pressureNCERT §1.6; §1.6.17 min06Elevation of boiling pointNCERT §1.6.27 min07Depression of freezing pointNCERT §1.6.310 min1 sim08Osmosis and osmotic pressureNCERT §1.6.4; §1.6.512 min1 sim09Abnormal molar masses and van't Hoff factorNCERT §1.78 min10Chapter reviewMust-know facts, traps and formulas16 min
Simulations
4 in this chapter
What does the vapour over a mixture contain?In: Vapour pressure and Raoult's lawWhen does a mixture stop obeying Raoult's law?In: Ideal and non-ideal solutionsWhy does salt lower the freezing point more than it raises the boiling point?In: Depression of freezing pointWhat pressure stops water crossing a membrane?In: Osmosis and osmotic pressure