COLLOIDS
A colloid is one of the three main types of mixtures, with the other two being a solution or suspension. 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. These are also known as colloidal dispersion s because the substances remain dispersed and don't settle to the bottom. In a colloid one substance is evenly dispersed in another. The substance being dispersed is referred to as being in the dispersed phase, while the substance in which it is dispersed is in the continuous phase. 
Colloids are substances which are dispersed through another substance. The different types of colloids are aerosols, foams, gels and emulsions.
Colloids allow the dispersion of normally insoluble materials, such as metallic gold or fats. These can then be used more easily, or absorbed more easily. Colloidal gold, for example, can be used in medicine to carry drugs and antibiotics, because it is highly non-reactive and non-toxic, unlike silver. In milk, the colloidal suspension of the fats prevents the milk from being thick, and allows for easy absorption of the nutrients.
However, colloids are frequently hard to extract or purify, which can lead to large losses in analysis or extraction, having a large impact on the economics of the process.
SOLUTIONS
A solution is a mixture of materials, one of which is usually a fluid. A fluid is a material that flows, such as a liquid or a gas. The fluid of a solution is usually the solvent. The material other than the solvent is the solute. We say that we dissolve the solute into the solvent.
Different Solutions
1. Gaseous Solution- includes gases or vapors dissolved in one another. Two or more gases can form a solution. Air is an example of a gaseous solution. When dry is made up of oxygen gas dissolved in nitrogen gas.
2. Liquid Solution- contain a liquid solvent in which gas, liquid, or solid is dissolved. Water is the most common liquid solution. Many things can be dissolved in it. Table salt is an example of a solid dissolved in a liquid. A liquid and a gas can also be dissolved in a liquid solution.
3. Solid Solution- is a mixture of solids spread equally throughout one another. Metal is an example of a solid solution at room temperature.
2. Liquid Solution- contain a liquid solvent in which gas, liquid, or solid is dissolved. Water is the most common liquid solution. Many things can be dissolved in it. Table salt is an example of a solid dissolved in a liquid. A liquid and a gas can also be dissolved in a liquid solution.
3. Solid Solution- is a mixture of solids spread equally throughout one another. Metal is an example of a solid solution at room temperature.
They are easy to measure if accurate measuring instruments are used
They are usually pleasing in appearance to the patient because of their color
and clarity
and clarity
They have a more rapid onset of action, when administered orally, than tablets
or capsules
or capsules
Risks:
The tastes of medications in solution are more pronounced. Some are almost
impossible to overcome.
There is a possibility of rapid deterioration and chemical reaction in solutions
Inaccurate measurements may result when using inaccurate measuring instruments
such as teaspoons
impossible to overcome.
There is a possibility of rapid deterioration and chemical reaction in solutions
Inaccurate measurements may result when using inaccurate measuring instruments
such as teaspoons
