A nurse is preparing to administer potassium gluconate 40 mEq PO. Available is potassium gluconate liquid 20 mEq/15 mL. How many ml should the nurse administer? (Round the answer to the nearest whole number. Use a leading zero if it applies. Do not use a trailing zero.)

Desired dose = 40 mEq. Available concentration = 20 mEq / 15 mL. Calculate the volume to administer. Volume (mL) = Desired dose (mEq) / (Available concentration (mEq) / Available volume (mL)) = 40 mEq / (20 mEq / 15 mL) = 40 mEq × (15 mL / 20 mEq) = (40 × 15) / 20 mL = 600 / 20 mL = 30 mL.