unit 1, lesson 1.5 - laboratory tools

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