What is the equation for calculating required HLB of a blend using weight fractions?
QUESTION
What is the Henderson–Hasselbalch equation for an acidic drug (HA) relating pH, pKa, and ratio?
QUESTION
What is the definition of isotonicity for a pharmaceutical solution relative to blood/tears?
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ANSWER
Same osmotic pressure as blood/tears; no net water movement. Ensures osmotic equilibrium with physiological fluids, preventing cellular dehydration or swelling upon administration.