Pharmaceutical Analysis | B.Pharm 1st year | Molarity, Molality and Normality in easy way

In this video, we will learn important concentration terms used in Pharmaceutical Analysis, specially useful for B.Pharm, D.Pharm & competitive exams. Concepts are explained in easy language with examples, so you can understand and memorize quickly.

1️⃣ Molarity (M) Definition: Molarity is the number of moles of solute present in 1 liter of solution. Formula: M = Moles of solute / Volume of solution (L) Uses: Widely used in pharmaceutical calculations, titrations, and solution standardization.

2️⃣ Molality (m) Definition: Molality is the number of moles of solute present in 1 kg of solvent. Formula: m = Moles of solute / Weight of solvent (kg) Uses: Used in temperature-dependent studies because molality does NOT change with temperature.

3️⃣ Normality (N) Definition: Normality is the number of gram equivalents of solute per liter of solution. Formula: N = Gram equivalent / Volume of solution (L) Uses: Mostly used in acid-base titrations, redox reactions, and precipitation reactions. 🔹

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✨ Additional Important Definitions
✔ Mole: Amount of substance containing Avogadro’s number (6.022 × 10²³) of particles.
✔ Equivalent weight: Molecular weight / n-factor.
✔ Solute: Substance that is dissolved.
✔ Solvent: Medium in which solute dissolves.
✔ Solution: Homogeneous mixture of solute and solvent.
✔ Concentration: Amount of solute present in given amount of solution or solvent.

🎯 Why This Topic Is Important? Frequently asked in B.Pharm/D.Pharm exams Useful in Pharmaceutical calculations & laboratory work Essential for titrations & preparation of standard solutions


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