Ontario Registered Pharmacy Technician (RphT) Practice Exam

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How much diluent do you need to add to a 4g vial to get a concentration of 250mg/mL?

  1. 12mL

  2. 14mL

  3. 16mL

  4. 18mL

The correct answer is: 16mL

To determine the amount of diluent needed, we can use the equation C1V1 = C2V2, where: - C1 is the initial concentration of the vial (4g) - V1 is the initial volume of the vial (unknown) - C2 is the desired concentration (250mg/mL) - V2 is the final volume of the solution (unknown) Plugging in the values to the equation, we get: 4gV1 = (250mg/mL)(1000mL). Solving for V1, we get V1 = 65mL. Therefore, to achieve a concentration of 250mg/mL in a 4g vial, we need to add 65mL of diluent. Option A, B, and D are incorrect because they do not correspond to the calculated volume

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