Presentation on theme: "بسم الله الرحمن الرحيم. Training the student about: Use of the analytical balance. Volumetric glassware measurement. Use of digital and glass."— Presentation transcript:
بسم الله الرحمن الرحيم
Training the student about: Use of the analytical balance. Volumetric glassware measurement. Use of digital and glass pipettes. Ideal preparation of different types of solutions (Standard, Saturated, Unsaturated and Percent solutions).
Normality (g eq/L): The concentration of a solution in equivalents per liter. Molality (W/W): Mole (mol.): A mass of a pure substance equal to its formula weight in grams (g). Molarity (W/V): The concentration of a solution in units of moles of solute per liter of solution.
In case of solids: 1 molar solution=M.W in gms.x100/purity%g/l. Example: 1 molar solution of NaOH: =40 x 100/96.0 g/l. In case of liquids: 1 molar solution=M.W x 100/purity x Sp.Gr. g/l. Example: 1 molar solution of acetic acid: = x 100/99.5 x g/l.
Take two conical flasks. Place distilled water in one flask and tape water in the other. Weigh 5 ml. of water six times from each flask using the analytical balance. Express your results in the table.
or = C.V. (Co. Var.)% = x 100
o Read the given details of the reagent from its bottle: o M.W. o Sp. Gr. / or wt/v at 20 c. o Purity % o Prepare the given table:
Prepare 250 ml. of 2M HCl. And NaOH solutions (see the table above). Keep the solutions for the next practical.
Prepare 20 ml. of saturated solution of Sodium chloride and Ammonium sulphate.
Prepare 100 ml. of percent solutions of Sodium chloride and Ammonium sulphate. (5%, 10%, 12% and 15%). Experiment 5: Preparation of Percent Solutions.