Homework n. 2 Some datn and universol canstants are not gien ond shall be found elsewhere fhandboaks, textbool. internet) or hypothesized 1. Calculate the Debye length for a suspension of alumina powder (IEP =9 ) at pH=7 in water containing 0.01MMgCl and 0.02M di Na2SO4. Draw the corresponding relative electrical potential curve. How does the Debye length change if the temperature is increased (draw a diagram)? What does it happen if methanol is used instead of water? 2. Titania (LEP = 4) powder is mixed with bl-distilled water containing 15 ppm CaCl2. Calculate the Debye length. Describe the behaviour and represent the surface of the particles (at atomic/molecular level) in case of the addition of aminoalcohol - see figure - (R=CH3) to the mixture and energetic mixing as a function of pH. 3. Calculate the Debye length and zeta potential for a suspension containing 0.01MHNO at 20C. Compare it with the thickness generated by the adsorption of oleic acid (C-C:1.54 A, C-H:1.09 A, CiC: 1.34A ) as shown below (pay attention to the bonds angie) 4. Calculate and draw the attraction potentiai (Van der Waals) UK the electrostatic repulsion