Basic Laboratory Techniques PDF

03/08/2024 Lesson Objectives: At the end of the discussion students are expected...

03/08/2024 Lesson Objectives: At the end of the discussion students are expected to: BASIC LABORATORY  To be able to master basic laboratory techniques TECHNIQUES of weighing mass, measuring volume, transfer and CHE 026 – GENERAL CHEMISTRY mixing of liquids, evaporation and filtration. A. Measuring Mass A. Measuring mass B. Measuring volume and reading scales C. Transferring liquids D. Mixing of Liquids E. Heating of liquids F. Evaporation G. Filtration A. Measuring Mass B. Measuring volume and reading scales Tare - pressing tare resets the balance's display to zero. 1  03/08/2024 B. Measuring volume and C. Transferring liquids reading scales Meniscus – the upward and downward curve at the surface of a liquid D. Mixing of Liquids D. Mixing of Liquids 1. If water is added to a beaker of concentrated acid, the heat generated in the process would be extremely large and could lead to splash out, burns and also breakage of the glass beaker due to overheating. 2. If we add acid to the water slowly, we are starting off by creating quite a dilute solution and the heat generated will not cause excessive damage. E. Heating of liquids E. Heating of liquids A Bunsen burner is a type of laboratory apparatus that is commonly used for heating, sterilization, and combustion in scientific experiments and procedures. It produces a safe, smokeless, hot, non-luminous flame that can be used for various scientific experiments. 2  03/08/2024 COMBUSTION E. Heating of liquids Combustion is a chemical process in which a substance reacts rapidly with oxygen and gives off heat. SOOT - a black substance formed by combustion or separated from fuel during combustion, rising in fine particles, and adhering to the sides of the chimney or pipe conveying the smoke. fuel + oxygen = carbon dioxide(CO2) + water (H2O) + energy (heat) E. Heating of liquids F. Evaporation DIRECT vs INDIRECT HEATING DIRECT vs INDIRECT EVAPORATION G. Filtration 3  03/08/2024 DECANTATION Thank you for listening! 4