Task: To make homogeneous mixture.
Required accessories: One beaker, measuring flask, spoon, stirrer, 4 watch glasses, glucose, water, wire-net, tripod stand and spirit lamp.
Procedure: Using a measuring flask take 200 milliliters of (a different amount may be taken) water in the well cleaned beaker. Now add 4-5 spoons of glucose in the beaker and stir gently. Let us see by testing whether the mixture prepared with glucose and water is a homogeneous mixture.
Divide the entire mixture into four portions and keep them in 4 watch glasses. Take weight of each watch glass individually using the balance and write down the weight. Now, place the watch glasses individually on the wire net over the tripod and apply heat with the help of burning spirit lamp to dry up the entire water Again take weight of each watch glass individually when they cool down. Calculate the mass of the glucose in each glass by subtracting the second weight from the first weight of each watch glass.
Analysis: Can you see the particles of the glucose anymore? Not really, as the glucose has entirely dissolved in water.
Now, see whether you have found the same amount of glucose to each watch glass. Yes, the obtained glucose in each watch glass is of the same mass. Hence, it can be said that the mixture of water and glucose was a homogeneous mixture, if it was not so, then in some portion glucose could be found more and in some portion it could be found less.
Do you know the name of the process by which the water became quite dry after applying heat? It is vaporization. That is the process in which heat is applied to a liquid to convert it to vapour state is called vaporization. Do you think that the glucose can be separated from water by any other process except vaporization? No. this is the only way, which is difficult to carry out and it is time-consuming too.
