Separation Techniques for Mixtures
The lesson covers various methods of separating mixtures, including filtration, evaporation, decantation, and chromatography. Each technique is explained along with its applications in obtaining pure substances from mixtures.
- 24:10 “of chromatography, paper chromatography, column chromatography, thin layer chromatography, gas chromatography, and a yarn exchange chromatography, the commonest of them and the cheapest of them is the paper chromatograph...”
- 23:23 “in external exam, VGC B2A, chromatography, tape load off, what tape load off, there are difference in the rate of movement of the constituents in the solvent over an adsorbent medium. The rate of movement depends on the...”
- 25:44 “In pure softness also give a single spot on the paper chromatography, on the paper chromatogram, but in pure softness we give more than one spot. That's another way of separating, of knowing that the softness is pure or...”
Solution and Solubility
This lesson covers the concepts of solution, solute, and solvent. It defines solubility and explains different types of solutions, including saturated, unsaturated, and super saturated solutions. Factors affecting solubility and calculations related to solubility are also discussed.
- 25:26 “this is a various seed we have, so we use solubility extraction to actually carry out some special processes in them, so now this solubility curve helps you to know the right solubility and temperature, this minimum opti...”
- 24:38 “as you can see it here, all right, are designated as the insoluble, but I've explained insoluble, then slightly or spirally, that's the meaning of this, this, and I use slightly or spirally, is the same thing, all right,...”
- 23:51 “that is you have calcium carbonate, for example, calcium carbonate and water is insoluble, techno of that, that is I here, you are seeing here, okay, so now the chart actually helps you to explain the effect of solubilit...”
Fundamental and Derived Quantities
This lesson covers the definitions of fundamental and derived quantities in physics. It explains how fundamental quantities serve as the base for deriving other quantities and the importance of measurement in physical science.
- 17:17 “The next one is the physical balance and it can be shown on the board in most of our lab. We see this kind of instrument there. And this is used in the lab and is similar to the beam balance. Because it is a lot more sen...”
- 18:06 “that we take. So object of this size, the object that we can use to measure it accurately is the physical balance. And this is normally used in pharmaceutical and the most times in the lab. The digital balance, this is t...”
- 16:31 “And that is the diagram on the board. This type of balance is commonly used in provision and grocery shop. That's the figure 12. The balance is compared sample mass with standard reference mass. The balance was on top of...”