●●● ●●●● ●●●●● 1. Experiment purposes ●●●● ●●●●● ●●●● .(1 Learn the basic principles of preparation of sol (colloid), and master the main methods of preparation sol; .(2) Mensurate the electrokinetic potential of Agl(silver iodide) sol by measuring the movement of interface1. Experiment purposes ⚫（1）Learn the basic principles of preparation of sol (colloid), and master the main methods of preparation sol; ⚫（2）Mensurate the electrokinetic potential of AgI (silver iodide) sol by measuring the movement of interface