Suspension and Colloids

Added: 2026-05-13

[00:00:00]now today we will be studying suspension and colloids the first will go to suspension so the first question comes what is suspension now before going to the definition let me explain what is suspension you have seen the dirty muddy water like pond water you've seen it all right in the pond water you'll see some particles which are settled down much you have seen the smoke which is coming out from the chimney you have seen it all right from a factory the smoke which is coming out from chimney of a factory all right you have seen that is you take a mixture of chalk and water you take some chalk and put it into water chop dust you take it and put it into water what do you find you'll find that everything settles down like chop when you put it into water you find the chalk particle settles down the chalk does it will start you see the smoke which is coming out of the factories you will see some fine particles are there how do we come to know like for example i am saying you like if you are going to ah route suppose station or somewhere you are putting your vehicle all right for one hour you put it your vehicle or for two hours you put your vehicle and do the marketing and count all right you just allow your scooter or your bike to park there in in the parking when you come back you just take your finger in this way and rub it over the seat you will see some particles these are black particles you can see or the seat or over the handle you know this you can see it alright what is that they are nothing but the suspended particles from where it has come because rakla is very near to the rock clustering plant the rockland main township i'm saying it's very near to the route cluster plant okay and there you see some particles from the chimneys the smoke which just comes out the particles are also coming out from from it all right this is smoke contains what particles suspended particles and this this settles down when it comes into the air the particle settles down so as you parked your vehicles it has got it has got settled down over your vehicle over the seat the dust particles okay i said you muddy water got it so that is nothing but known as a suspension they are called a suspension or otherwise known as suspended particles they said to yes i hope you understood there is chalk in water or the smoke which contains the particles i told you the examples or the ponds the the mud the dirty water which is the dirty means the particles you see floating there and all these things they are known as suspended particles so hence what is a suspension a suspension is a heterogeneous mixture these are all heterogeneous mixture it is not same throughout in which very fine particles and the size of the particle remember it 10 to the power minus 7 meter the size of the particle in case of suspension or more it can be all right it's a heterogeneous mixture in which very fine particles of the size 10 to the power minus 7 meter or more of solid are dispersed in any particular medium all right like some smoke contains the dust particles but it the water contains the chopped dust all right the muddy water contains the mud clay and all those things which is there so in this way there that is called a suspension all right i hope you understood the definition it is a heterogeneous mixture in which the size of the particle is 10 to the power minus 7 meter or more and it is being dispersed in a particular medium or in a particular solvent fine now it is heterogeneous nature already said you the particle size it is in front of you 10 to the power minus 7 meter or even larger than that the particles can be all right and it settles down it settles on sediments for example you take some muddy water not it in a glass a clean glass you take it you may take somebody what you you just don't disturb that water for some time you will see that the mud or the clay settles on the bottom what is that that is nothing but on a suspended particles that's a sediment suspended particles so all this suspended particle settles down for that i said that when you're parking a vehicle in alkali you will see that the suspended particles which are present in the smoke it settles down it settles down on the on your seats on the wake on your scooty or on your ah what against the seat of your bike it settles down so it settles always its sediments got it so they are very fine particles which remain in the suspension they settle down okay and it can be separated by the help of filtration definitely for example chalk water chalk and water how you separate it you filter it you will be getting it chalk separately and water separately for example muddy water filter it you will be getting modern clay separately from the water so you can separate it by filtration got it no you understand what is suspension got it now basically uh here we will see there are three kinds of what you can substances are there one is a true solution one is a true solution now what is true solution for example a solution of salt in water a sugar in water that's a diverse true solution another is your colloidal solution second colloidal solution i'm coming to that and the third is your suspension all right third is your suspension we can say that clear i will come to the difference but first let me send you colloids water colloids a colloid is a homo homogeneously looking it is homogeneously looking but it's not homogeneous is a heterogeneous ah mixture got it ah it is also called as commonly known as soul and the size of the particle is one nanometer on it or um one nanometer to thousand nanometer all right thousand nanometers the size of the particle varies so one nanometer means ten to the power minus nine meter we can say that so the particle size varies from one nanometer to thousand nanometer it is said to be as got it so particle sizes or ten to the power means nine meter it is generally known as soul in short we call it a solar we can say that colloidal solution it is known as so colloids so ah colloidal solution actually it is a continuous medium in which we are having a dispersed phase and this dispersion medium all right we are having a dispersed phase and dispersion medium listen carefully what i am saying this first phase the uh what you can say dispersal medium is nothing but a solvent and dispersed phase is nothing but known as a solute because solution is made up of what solvent and solute so generally the dispersant medium is called as a solvent and the dispersed phase is known as the solute remember it the particles of the dispersed phase are present in the dispersion medium so let me give you an example colloids are nothing but milk is a colloid then your gum is a colloid gum gum with a paste all right that's a colloid then blood is a colloidal solution we can say that the toothpaste is a collagen solution jelly is a quality solution giants or jellies they are the colloids we can say that all right then starch is a collagen solution fog or the mist is a colloidal solution we consider that clear in this in the fog and the fog and the mist what is that the dust particles is your dispersed face all right and the dispersant medium is nothing but known as the water clear similarly in blood the uh what you can say the formed elements rbcs wbcs they are the what you can say formed elements that is honest they are the dispersed phase and the plasma that is a liquid one it is said to be as a dispersal medium in this way we are having dispersed within dispersion medium so we are having fog we are having nothing but is your blood we are having that is your jams jellies we are having that is milk there there is then gum the starch solution they are all coming under colloidal solution which is made up of two dispersed phase in the dispersion medium fine now there are ah what you can say different types of collage we are having we are having liquid liquid colloids they are having liquid gas colloids all right liquid gas polarity is liquid aerosol liquid gas liquid gas is your fog or the spray this liquid sprayer now you are using the hand sanitizer got it that is the liquid sprays they are coming under the liquid gas colloids we are having solid gas collides they are having liquid liquid collides and these are different types of colloids are there all right we are having it now if you see the properties of the colloid just like your suspension they are heterogeneous in nature the particle size already i have said you they are the colladen solution generally pass through ordinary filter paper but it cannot pass through ultra filters a special kind of filter paper that is called as ultra filter all right and they can be separated by ultra filtration only now they are unstable they are not stable they are unstable that is unless and until it is stabilized they are not stable in nature they show the brownian movement browning is nothing but the zigzag motion this exact moment is said to be as a brownian movement the rapid zigzag moment means you take you just take a collated solution and observe it through a microscope you will find it out you cannot see the naked eyes understood by microscope you have to observe it when you observe it through a microscope you will find fine the particles that the dispersed phase the particles are striking one another but it continuously got it continuously in this way manner it's striking this particular strike this this this in this way so this is a continuous random motion this exact motion that is known as the brownian motion the white is called brownian because robert brown an english biologist he find find it out for the first time and he called it by his name that is brown in motion next is it shows spindle effect what do you mean by tinder effect tyndall effect means you take a colloidal solution suppose you have taken a beaker you take some colloidal solution pass a strong beam of light strong view of light you will see the light gets scattered scattered in the form of cone what is that one is tinder this is on the standalone and the effect is on a spindle effect this is called us all right when you pass a strong beam of light through a colloidal solution the light gets scattered it does not pass through through a true solution the light will pass through suppose you take a sugar solution of the salt solution if you take a strong beam of light strong being not does not mean a torch light no strong beam of light mercury light or something light we can say that clear so you pass it through it you'll find the light in case of colloidal solution it gets scattered see here in the figure it gets scattered in this wave get dispersed in the form of cone that is called the tyndall cone and the effect is known as tyndall effect that's it yes if you take a true solution like sugar or salt solution the light is simply pass through because true solution is transparent and colored solution is translucent translucent means light partially passes through and suspension are opaque the light does not pass at all it does not pass at all we can select clear we can say in this way understood what is tinder effect the light gets scattered we can say that light gets scattered when you are passing the strong beam of light through colloidal solution then ah it also shows the phenomenon of electrophoresis now electrophoresis means when you pass electric charge or collateral solution then what you can say is that the particles the colloidal particles which are having the positive and the negative charge they are pulled towards the two different electrodes they are being pulled towards see we are having two electrodes are there in a battery two electrodes are there one is a cathode another is the anode cathode is negatively charged and iron is what you can say positively charged so positively charged particles will pull towards the negative electrode and the negatively charged particles will be pulled towards a positive electrode because opposite charges attracts life charges ripples remember it what i said the positive let us say this is positive and this is negative all right the blue one is positive and this is negative so if it is positive charge the negatively charged particles will go here if this is negatively charged the positively charged particles will go here in this way so in case of colloidal solution what you pass what it is that as it constitutes collateral solution uh sometimes it cannot all not all colors some certain collides that constitutes of charges and when you pass electric current through it it dissociates into its charges got it that is called as electrophoresis that is the movement of the colloidal particles under the influence of electric field is known as electrophoresis we can say that next is colloidal valid is being used colonial solution it is used in medicines all right like many medicines are used as colloids it is used in our food as i said you the jams the jellies they are the food we can say that the milk is a colloid which is being used as a food starch it is protein they are also used as a food we can say that correct colloidal gold colloidal silver they are also being used in the form of medicines we are using it got it rubber it is a natural colloid you can say the lattice which from which you are making rubber these are natural colloids we can say that the formation of deltas it is nothing but due to collateral solution we can say so all these are known as the uses of colloids i hope you understood thank you