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Lab Equipment

Lab Equipment. Beakers. Beakers hold solids or liquids that will not release gases when reacted or are unlikely to splatter if stirred or heated. Erlenmeyer Flasks.

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Lab Equipment

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  1. Lab Equipment

  2. Beakers Beakers hold solids or liquids that will not release gases when reacted or are unlikely to splatter if stirred or heated.

  3. Erlenmeyer Flasks Erlenmeyer flasks hold solids or liquids that may release gases during a reaction or that are likely to splatter if stirred or heated.

  4. Graduated Cylinders A graduated cylinder is used to measure volumes of liquids.

  5. Graduated Cylinders The glass cylinder has etched marks to indicate volumes, a pouring lip, and quite often, a plastic bumper to prevent breakage.

  6. Graduated Cylinders Reading the Meniscus Always read volume from the bottom of the meniscus. The meniscus is the curved surface of a liquid in a narrow cylindrical container.

  7. Graduated Cylinders Try to avoid parallax errors. Parallax errors arise when a meniscus or needle is viewed from an angle rather than from straight-on at eye level. Incorrect: viewing the meniscus from an angle Correct: Viewing the meniscus at eye level

  8. Buret/Ring Stand/Clamp The buret is used for titrations. The clamp holds the buret to the ring stand. Ring stands can be used for a variety of laboratory set-ups.

  9. Wire Gauze (Mesh)/Ring Used often in general chemistry for heating things on. Also has other uses. • A ring is used to hold things. In general chemistry this is used to hold wire mesh to heat things on.

  10. Evaporating Dish/Watch Glass These are used for heating things over a Bunsen burner. They are ceramic, and so are relatively flame resistant. Often placed on a ring (on a ring stand) or on a wire mesh on a ring. • Commonly used to cover containers; also can be used to hold a small amount of solid, such as the product of a reaction.

  11. Thermometers

  12. Thermometers Do not allow the tip to touch the walls or the bottom of the flask. If the thermometer bulb touches the flask, the temperature of the glass will be measured instead of the temperature of the solution. Readings may be incorrect, particularly if the flask is on a hotplate or in an ice bath.

  13. Hot Plate/Magnetic Stir Bars Used mainly for heating and also used for stirring solutions using stir bars

  14. Test Tubes 13 x 100 mm test tubes Ignition Tube 10 x 75 mm test tubes

  15. Test Tube Holder A test tube holder is useful for holding a test tube which is too hot to handle.

  16. Test Tube Brushes Test tube brushes are used to clean test tubes and graduated cylinders. Forcing a large brush into a small test tube will often break the tube.

  17. Test Tube Racks Test tube racks are for holding and organizing test tubes on the laboratory counter. Plastic racks may melt in contact with very hot test tubes.

  18. Rubber Stoppers Rubber stoppers are used to close containers to avoid spillage or contamination. Containers should never be heated when there is a stopper in place.

  19. Well Plates Well plates are used when we want to perform many small scale reactions at one time. We will use these many times during the year.

  20. Glass Stir Rod A glass rod is used to manually stir solutions. It can also be used to transfer a single drop of a solution.

  21. Forceps Forceps (or tweezers) are used to pick up small objects.

  22. Funnel A funnel is used to aid in the transfer of liquid from one vessel to another.

  23. Wash Bottle A wash bottle has a spout that delivers a wash solution to a specific area. Distilled water is the only liquid that should be used in a wash bottle.

  24. Spatulas Spatulas are used to dispense solid chemicals from their containers. Chemicals should never be transferred with your bare hands.

  25. Weighing Boats Weighing boats are used to weigh solids that will be transferred to another vessel.

  26. Triple-Beam Balance • Calibrate the scale by sliding all three weights to their leftmost positions. Twist the zeroing screw until the balance pointer lines up with the fixed zero mark. • Place the object to be weighed on the center of the pan. • Slide the 100-gram weight right one notch at a time. When the indicator drops below the fixed mark, move the weight left one notch. • Repeat with the 10-gram weight. • Slide the 1-gram weight slowly across the third beam. Stop sliding when the pointer lines up with the fixed mark. • Add the values of all three beams to determine the mass of your object.

  27. Electronic Balances Top Loader You should always zero out an electronic balance before weighing your material. (TARE button) TARE = weight of container GROSS = weight of material + container NET = weight of material

  28. Bunsen Burner Used to burn things, the flame test, and sometimes to heat things. NOT used in the presence of inflammable chemicals. Bunsen Honeydew *NOT* Bunsen Burner

  29. Pipette This is used in all of the chemistries for measuring out small quantities of a substance relatively imprecisely. Also often used as a dropper.

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