What volume of potassium chloride solution (2 mEq/ml) is needed for 25 mEq?

To determine the volume of potassium chloride solution that contains 25 mEq, we need to use the concentration of the solution, which is 2 mEq/ml. The calculation involves using the formula:

[

\text{Volume (ml)} = \frac{\text{Desired mEq}}{\text{Concentration (mEq/ml)}}

]

Plugging in the values:

[

\text{Volume (ml)} = \frac{25 \text{ mEq}}{2 \text{ mEq/ml}}

]

Calculating this gives:

[

\text{Volume (ml)} = 12.5 \text{ ml}

]

Therefore, the correct answer is 12.5 ml, as this is the volume needed to obtain 25 mEq of potassium chloride from a solution that has a concentration of 2 mEq/ml. This calculation is crucial in pharmacy practice to ensure accurate dispensing and administration of medications.