PPT-Calculating the amount of substance needed in an initial concentration to produce a final

Calculating the amount of substance needed in an initial concentration to produce a final desired dilution and volume Example 1 What amount of a substance is required to make 1500mL of a product such that 50mL diluted to 1000mL will give a 1 vv concentration. A true story. Standards. Science: Chemistry . 6.d. Students know how to calculate the . concentration . of a . solution.. Investigation and Experimentation. . 1a. Select and use appropriate tools. Jessica . johnson. , pharm. D.. Topics covered. Reconstitution of dry powders, or powder volume (section 11 in math book). Reconstituted means that we are adding water, or another diluent, to a powder to make a liquid suspension or solution. . Solution Preparation. How do we create chemical solutions in a laboratory setting with a certain concentration/molarity? . Obtain the mass of the chemical compound serving as solute. Dissolve the solute in a small amount of the solvent. Dilution. Reducing the concentration of a solution by adding . more . solvent. The number of MOLES remains constant. C1V1 = C2V2. To find desired volume of a given 2. nd. concentration. To find a desired concentration for a given 2. Lesson 6. Concentration. Concentration:. Is a measure of the amount of substance (solute….usually solid) that exists in a volume of solution (solvent).. Concentration. The amount of solute in a solution.. Concentration. The amount of a specific substance in a known volume of solution. Concentrated Solutions. The amount of substance dissolved in solution is very high . It is difficult to dissolve more substance into solution. Lecture 2. Preparation of Solutions. It could be prepared either from:. 1- Solid material.. 2-Liquid.. Preparation of Solutions from Solid Material. In general it follows a 4 . steps. :. Weigh . the . Most solutions are stored in concentrated form and diluted for use when required. . To dilute to the required concentration we must extract the number of moles required from the stock solution and place them in the new flask. . Example 1. Calculate the amount of each ingredient required for 1225mL of the formula listed below.. AT A GLANCE/. PHARMACY CALCULATIONS. FORMULATIONS. Ingredient. Master formula. Substance A. 175g. Substance B. Calculating how much base to add to a product to achieve a lower desired concentration. Example 1 How much water should you add to 100mL of a 10% v/v solution to reduce it in strength to a 4% v/v solution? Example 1. How much ingredient A should you add to 100mL of a 10% v/v solution to increase it in strength to a 20% v/v solution?. Method. . AT A GLANCE/. PHARMACY CALCULATIONS. INCREASING A % SOLUTION. Example 1. How much bismuth subsalicylate is contained in a 236mL bottle of 17.6mg/mL concentration?. Method. Step 1: . An amount strength is a fraction..  . Step 2: . By multiplication.  . 20. 2. Example 2. Example 1. How much chloroform is contained in 500mL of a 2% v/v concentration?. Method. Step 1: . A percentage is a fraction with a base of 100..  . Step 2: . By multiplication. *Remember, this is a . Example 1. What amount of a substance is required to make 1500mL of a product such that 50mL diluted to 1000mL will give a 1% v/v concentration?. Method. Step 1: . Calculate the quantity of substance in the final dilution.