The speed of colloidal particles in a colloidal sol at different pH values during electrophoresis are given below : {:(pH, 4.20,4.56,5.20,5.65,6.30,7.0),("Speed",+0.50+,0.18,-0.25,-0.65,-0.90,-1.25):} (mums^(-1)) (opposite signs indicate opposite direction of travel) The isoelectric point of the colloidal sol will be

The speed of colloidal particles in a colloidal sol at different pH va

1.	The speed of colloidal particles in a colloidal sol at different pH values during electrophoresis are given below : {:(pH, 4.20,4.56,5.20,5.65,6.30,7.0),("Speed",+0.50+,0.18,-0.25,-0.65,-0.90,-1.25):} (mums^(-1)) (opposite signs indicate opposite direction of travel) The isoelectric point of the colloidal sol will be
Answer» `4.2` `4.8` `7.0` `5.20` Solution :Isoelectirc point of a COLLOIDAL sol is the pH at which colloidal particles carry no charge. Above this pH, colloidal particles varry positive or NEGATIVE charge and below this pH, the aharge is reversed. THUS, REVERSAL takes PLACE between `4.56 and 5.20.`