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Calculations involving percentage solutions

1.Percentage Solutions:

  • These are solutions where the concentration of a solute in a solution is expressed as a percentage.

  • In pharmacy, this typically refers to:

  • Weight/Volume (w/v)

  • Weight/Weight (w/w)

  • Volume/Volume (v/v) percentages.

2.Weight/Volume Percentage (w/v):

  • Used for: Solid substances dissolved in a liquid.

  • Definition: Expressed as grams of solute per 100 mL of solution.

  • Calculation:

  • Example:

    • If 5 grams of a drug are dissolved in 250 mL of solution, the concentration is:


3.Weight/Weight Percentage (w/w):

  • Used for: Mixtures of two solid substances.

  • Definition: Expressed as grams of solute per 100 grams of the total solution.

  • Calculation:


4.Volume/Volume Percentage (v/v):

  • Used for: Solutions where both solute and solvent are liquids.

  • Definition: Expressed as milliliters of solute per 100 mL of solution.

  • Calculation:

This organized layout clearly separates the different types of percentage solutions with corresponding explanations, formulas, and examples.


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