Why is a knowledge of properties of solutions and mixtures necessary for a career in cosmetology?
• Another interesting mixture can be made by mixing 20 mL liquid laundry starch with 10 mL white glue and a small pinch of salt. Stir until it becomes doughy and then remove from the mixing container and knead. If the mixture is too runny to remove from the container, add 5 – 10 drops of white glue and a few grains of salt. How does this mixture compare with the starch/water mixture? The mixtures containing starch are examples of colloids. A colloid which you might want to try is made by mixing 10 parts ethanol (ethyl alcohol) with 1 part saturated calcium acetate solution. Saturated calcium acetate is made by slowly adding 100 mL of water to 40 grams of solid calcium acetate, stirring as the water is added. The colloid produced is a gel of the type that is used to produce solid fuels such as Sterno. The acetate/alcohol colloidal gel will burn with a hot, blue (almost colourless) flame. A good way to burn it is to place a piece on a wire screen supported well above the surface of a tab
