Post on 12-Aug-2015
Laboratory ToolsUNIT ONE, LESSON 1.5BY MARGIELENE D. JUDAN
LESSON OUTLINEIntroductionUses of Laboratory ToolsLaboratory ToolsFeature: Filipino Scientist of the Week!
USES OF LABORATORY TOOLSContainers Measure and TransferSupportHeatingSafety
Erlenmeyer Flask-heat and store liquids-bottom is wider so it will heat up quicker because of the greater surface area exposed to heat
Florence Flask-for heating substances that needs to be heated “evenly” (notice its circular base)
Volumetric Flask-measures an specific volume-used mostly in preparing solutions
Reagent Bottle-for storage, mixing, and displaying(Chemicals that react easily to sunlight are placed in the dark bottle to avoid exposure)
Beaker-holds and heats liquids
Test Tube-for holding, mixing, and heating “small” amounts of liquid
Test Tube Brush-for cleaning test tubes
Test Tube Holder-for holding test tubes while being heated
Test Tube Rack-to hold test tubes upright while observing reactions or when they are not used
Buret-used to deliver solution in precisely-measured volumes-used mainly in the process “titration”-placed in a ring stand for support
Pipet-moving “small” amounts of liquid from one container to another
Funnel-transfers liquids into another container to avoid spillage (not only limited to laboratory use)
Stirring Rod or Glass Rod-for stirring solutions to dissolve substances
Bunsen Burner-for heating and exposing items to flame(connected to a gas source [see top image])
Crucible-for heating small amounts of substances in very high temperatures
Clay Triangle-holds crucibles when being heated
Evaporating Dish-heats and evaporates liquids
Mortar and Pestle-crushes or grinds solids into powders
Micro-spatula-or “spatula” is used for transferring small amounts of “solid” from one container to another
Tongs-holds many different things (crucibles, flasks, evaporating dishes) when they are hot
Ring Stand-to support items being heated-clamps or rings can be used so that other items may also be placed above them
Cork or Stopper-for sealing test tubes and flasks
Thermo-meter-measures temperature of solids, liquids, and gases
Commonly Confused Tools
Commonly Confused ToolsERLENMEYER FLASK
-bottom is wider
Why wider?
-To heat liquids “faster”
FLORENCE FLASK -bottom is round
Why round?
-To heat liquids “evenly”
Commonly Confused ToolsBEAKER
-for holding, storing, and heating “medium to large” amounts of liquid
-mostly for stirring and combining liquids
TEST TUBE -for holding, storing and heating “small amounts” of liquid
-mostly for observing a chemical reaction
Commonly Confused ToolsCRUCIBLE
-mainly for heating substances (usually solids) at very high temperatures
-ceramic
EVAPORATING DISH -mainly for evaporating
-ceramic
Filipino Scientist of the Week!
Fabian M. Dayrit (born ?)
Fabian M. Dayrit Rank: Professor (Full-time) Education:BS Chemistry, Ateneo de Manila University (Top 10 Chemistry Licensure Exam 1975)M.A. and PhD. Chemistry, Princeton University
Fabian M. Dayrit Notable Scientific Accomplishment:Has worked on medicinal plants such as lagundi, ampalaya, malunggay, achuete, and other plants with support from his group NIMPROMP.
Because of this research, it is established how effective lagundi (vitex negundo) is for colds
Sources:Science Links 7http://www.admu.edu.ph/ls/sose/chemistry/faculty/dayrit-fabian-m