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Lab Equipment - PowerPoint PPT Presentation

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Lab Equipment

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  1. Lab Equipment

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

  3. Erlenmeyer Flask 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 Cylinder A graduated cylinder is used to measure volumes of liquids.

  5. Test Tubes 13 x 100 mm test tubes 10 x 75 mm test tubes

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

  7. 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.

  8. 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.

  9. 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.

  10. Spot Plates Spot plates are used when we want to perform many small scale reactions at one time.

  11. Watch Glass A watch glass is used to hold a small amount of solid, such as the product of a reaction.

  12. Glass Stirring Rod A glass stirring rod is used to manually stir solutions. Careful these can break easily if dropped (even into the sink).

  13. Medicine Dropper A medicine dropper is used to transfer a small volume of liquid (less than one mL). On top of each medicine dropper is a “rubber bulb”

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

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

  16. 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.

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

  18. Beaker Tongs Beaker tongs are used to move beakers containing hot liquids

  19. Bunsen Burner Bunsen burners are used for the heating of nonvolatile liquids and solids.

  20. Flint Lighters Flint lighters are used to light Bunsen burners. The flint that is used are expensive. Do not operate the flint lighter repeatedly just to see the sparks!

  21. Evaporating Dish The evaporating dish is used for the heating of stable solid compounds and elements.

  22. Crucible Crucibles are used for heating certain solids, particularly metals, to very high temperatures.

  23. Clay Triangle The clay triangle is used as a support for porcelein crucibles when being heated over a Bunsen burner.

  24. Crucible Tongs For handling hot crucibles; also used to pick up other hot objects. NOTto be used for picking up beakers!

  25. Ringstands and their Components Ringstands are a safe and convenient way to perform reactions that require heating using a Bunsen burner.

  26. Ringstands and their ComponentsIron Rings Iron rings connect to a ringstand and provide a stable, elevated platform for the reaction.

  27. Ringstands and their ComponentsUtility Clamps Utility clamps are used to secure test tubes and other equipment to the ringstand.

  28. Ringstands and their ComponentsWire Gauze Wire gauze sits on the iron ring to provide a place to stand a beaker. On older wire gauze, the white material is asbestos!

  29. 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.

  30. Try to avoid parallax errors. Parallaxerrorsarise when a meniscus or needle is viewed from an angle rather than from straight-on at eye level. Correct: Viewing the meniscusat eye level Incorrect: viewing the meniscusfrom an angle

  31. Use the graduations to find all certain digits There are two unlabeled graduations below the meniscus, and each graduation represents 1 mL, so the certain digits of the reading are… 52 mL.

  32. Estimate the uncertain digit and take a reading The meniscus is about eight tenths of the way to the next graduation, so the final digit in the reading is . 0.8 mL The volume in the graduated cylinder is 52.8 mL.

  33. Example : What volume of liquid would be found in this 25mL graduated cylinder? 1 1 5 _ _ . _ mL