Answer:

1. To make a dilution, you simply add a small quantity of a concentrated stock solution to an amount of pure solvent. The resulting solution contains the amount of solute originally taken from the stock solution but disperses that solute throughout a greater volume.
2. The main difference between the dilute solution and concentrated solution is that dilute solution contains less solute and the concentrated solution contains more solute. A liquid with a high solute concentration is called a concentrated solution. A liquid with a less solute concentration is called a dilute solution.
3. Methods of Expressing Concentration of Solutions

• Percentage by weight (w / w %)
• Percentage by volume (V / V%)
• Weight by volume (w / v%)
• Mole fraction (x)
• Parts per million (ppm)
• Molarity (M)
• Molality (m)
• Normality (N)
• Etc.