LIST OF EXPERIMENTS 503 



(r) By indicators. 

 *((/) By cundiictivity. 

 *23. H ion concentration by potentiometer. 

 *24. pH and surface tension. 

 25. Buffer solutions. 



{n) S<)r('iis('ii\s (range pK 4-5-9-2). 

 *(6) C^a/-/; and Lubs. (I.) ;jH 2-2-3-9. 



(II.) 4-6-3. 



(III.) 5-8-8-0. 

 (IV.) 7-8-10-0. 

 Chapter VIII.^ — 26. Separation of colloids from crystalloids. 



(1) Preparation of dialysers. 



(2) (a) Albumen -(- sodium chloride, etc. 



(b) Congo red and hydrochloric acid. 



(c) Blood serum. 



((/) Colloidal iron and hydrochloric acid. 



Optical properties of colloids. 

 *27. A. Faraday-Tyndall phenomenon. 



B. Polarisation of the Tyndall cone. 

 *28. A. Ultramicroscope. 



B. Brownian movement. 



29. Diffusion. 



(a) Colloid into colloid. 

 (6) Crystalloid into colloid. 



(c) Acid into colloid. 



(d) Electrical diffusion. 



30. Liesegang phenomenon. 



*{a) Plate rings. 



(6) Tube strata. 



(c) Efiect of capillary active substances on the 

 formation of strata. 



{d) Dead space. 

 *(e) In air. 



31. Viscosity. 



(a) Compare solution, sol and gel. 

 (6) Effect of mechanical agitation on the viscosity 

 of gelatin. 



(c) Effect of concentration on the viscosity of 



colloids. 



(d) Effect of temperature on the viscosity of gelatin. 



(e) Effect of electrolytes on the viscosity of gelatin. 

 (/) Effect of pH on the viscosity of acacia. 



32. Determination of the isoelectric point of a protein. 



(«) Casein by acid precipitation. 



(6) Gelatin (Loeb's method). 



(c) Gelatin by alcohol precipitation. 

 *33. Osmotic pressure of gelatin. 

 *34. Cataphoresis. 

 *35. Electric endosmose. 

 36. Coagulation of sols at isoelectric point. 



(a) Ijy heat. 



(6) By electrolytes. 



(c) By mutual precipitation. 



