Tiêu đề 7. CALCULATIONS INVOLVING PERCENTAGE SOLUTIONS.pdf ✅

PHARMD GURU Page 1 The concentration of a solution is often expressed as the percentage of solute in the total amount of solution. For the extremely dilute solutions the concentration unit parts per million (ppm) is often used. Since the amounts of solute and solution present can be stated in terms of either weight or volume. A percentage solution is an weight or volume of something per 100 ml or 100 g of a solution. Percentage means rate per hundred. 50% means 50 parts in 100 of same kind = 50/100 = 0.5 There are three types of percentage solution: 1. Percentage weight by volume (w/v). 2. Percentage volume by volume (v/v). 3. Percentage weight by weight (w/w). 1. Percent weight in volume w/v: number of gram of a constituent in 100 ml of solution or liquid preparation. 2. Percent volume in volume v/v: express number of ml of a constituent in 100 ml of a solution or preparation. 3. Percent weight in weight w/w: express number of gram of a constituent in 100 gram of a solution or preparation. CALCULATIONS INVOLVING PERCENTAGE SOLUTIONS
PHARMD GURU Page 2 1. PERCENTAGE WEIGHT BY VOLUME (W/V): Concentration (expressed in %) = Quantity or volume of solute Quantity or volume of preparation EXAMPLE-1: EXAMPLE-2:
PHARMD GURU Page 3 EXAMPLE-3: 2. PERCENTAGE VOLUME BY VOLUME (V/V): EXAMPLE-1:
PHARMD GURU Page 4 EXAMPLE-2: EXAMPLE-3: 3. PERCENTAGE WEIGHT/WEIGHT (W/W):
PHARMD GURU Page 5 EXAMPLE-1: EXAMPLE-2: EXAMPLE-3: