Concentration refers to the amount of solute dissolved in a given amount of solvent or solution. It is expressed in different units such as molarity, molality, mass percentage, volume percentage, and others.



To calculate the amount of solute needed to make a 3% v/v solution, we need to know the definition of volume percent concentration. Volume percent concentration is the volume of solute per 100 volumes of solution.

We can use the following formula to calculate the amount of solute:

Amount of solute (in ml) = Volume of solution (in ml) x Volume percentage concentration / 100

Therefore, for a 3% v/v solution, we can calculate the amount of solute as follows:

Amount of solute (in ml) = 250 ml x 3 / 100

Amount of solute (in ml) = 7.5 ml

Therefore, 7.5 ml of solute must be dissolved in 250 ml of solvent to prepare a solution of concentration 3% v/v.



In summary, the amount of solute required for a 3% v/v solution can be calculated using the formula:

Amount of solute (in ml) = Volume of solution (in ml) x Volume percentage concentration / 100

By substituting the values given in the problem, we can determine that 7.5 ml of solute is needed to prepare a 3% v/v solution in 250 ml of solvent.

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