Prelab (1).  A colloid is a solution that has particles ranging between 1 and 1000 nanometers in diameter, yet are still able to remain evenly distributed.

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Presentation transcript:

Prelab (1)

 A colloid is a solution that has particles ranging between 1 and 1000 nanometers in diameter, yet are still able to remain evenly distributed throughout the solution.  one substance is evenly dispersed in another

 The substance's dimensions must be between (1 and 1000 nanometers). If the dimensions are smaller than this the substance is considered a solution and if they are larger then the substance is a suspension.

 Easily removed from container.  Taste should be acceptable.  The sediment produced upon standing should re- dispersed.  Upon shaking the particles should be in a suspension form for enough time for taking correct dose.  Cake not happen upon standing.

I.They do not dissolve in water. II.Fine III.Heavy IV.do not need suspending agent as they are easily diffused throughout the liquid for sufficient time. Examples : Rhubarb powder, Bismuth carbonate, Aromatic chalk powder, light MgCO3.

Agents used to increase the viscosity of the medium.

Means dispersion of particles into vehicle depending on the contact angle. Hydrophilic particles Hydrophobic particles

Magnesium SulphateMagnesium Carbonate Peppermint Water

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Purgative and Antacid in case of Liver Cirrhosis