LABORATORY GLASSWARE AND APPARATUS Beaker A general purpose container for Funnel holding or mixing liquids with a Funnels are used for adding liquid to pouring spout. Some beakers have narrow mouth containers, or, with fil- graduations on them indicating ter paper, for filtering solutions approximate volume of contents. Erlenmeyer flask Funnel, powder A general purpose container used A funnel with a short, wide stem for for holding or mixing liquids. Some use in pouring powders into narrow flasks have graduations on them to mouth containers. indicate approximate volume of contents. Graduated cylinder Florence flask A measuring device, graduated to Sometimes referred to as a boiling flask. contain liquids or solutions. Tall A general purpose container used for cylinders should be equipped with a holding or boiling liquids. plastic bumper to absorb impact if the cylinder is tipped over. Filtering flask Dropping pipet A heavy wall flask designed for A medicine dropper used to deliver use in suction (vacuum) filtration liquids in dropwise amounts. of solutions. Has side hose connection to attach vacuum tubing. Pasteur pipet A capillary tip dropper used to deliver small drops. These are usually disposable. Rubber bulb Volumetric flask Fits Pasteur, and other dropping pipets. A flask used for preparation of These are reusable. solutions. Volumetric flasks are calibrated to contain a specific volume Watch glass of liquid or solution. A glass dish that can be used for evaporation of small amounts of liquids, for studying small amounts of solids, or as covers for beakers. Test tube Evaporating dish A round-bottom glass tube used A dish used for heating and to contain or heat small amounts of evaporating samples. Usually made of materials. porcelain or glass. Crucible and cover Centrifuge tube A cup, with cover, used for heating A test tube with a tapered samples to high temperatures. Usually bottom for use in laboratory made of porcelain, glass, or metal. centrifuges. Solid materials will collect in the bottom taper during Gooch crucible use. A crucible with a perforated bottom used for filtering and drying precipitates. 37 Casserole Büchner funnel A crucible with a handle for A funnel, usually made of controlled hand-held heating of porcelain, for use in suction filtration of samples. liquids and mixtures. Wash bottle, plastic A squeeze bottle used to Separatory funnel produce a steady stream or a few Used to separate immiscible liquids drops of liquid for rinsing or solutions. Contents can be emptied materials from test tubes, beakers into small flasks or beakers. or flasks. Bottle, reagent Thistle tube A narrow mouth bottle for A long stem funnel-type device used holding laboratory reagents. May when liquids or solutions are added to have a glass or polyethylene stopper. a reaction in a closed flask. Thermometer Bottle, gas collecting Either mercury or alcohol filled, used A wide mouth bottle commonly used to measure temperature in laboratory for collecting gases by water operations. displacement. Liebig Condenser An in-line cooling device used for distillation or reflux operations. Buret Outer jacket allows water flow for A graduated measuring device for efficient cooling. delivering precise volumes of liquids or solutions. Thiele tube Used as an oil bath for melting point determinations. The side arm allows for circulation of hot oil contained in Volumetric (Transfer) pipet tube. A measuring device calibrated to deliver a specific amount of liquid or solution. Desiccator A container used to store materials in a dry, air tight environment. Desiccant is placed on the bottom Mohr (graduated) pipet to absorb moisture assuring a A measuring device calibrated to deliver moisture-free environment. Some small quantities of liquid up to the desiccators can be vacuum sealed. capacity of the pipet. Bunsen Burner A gas burner used for general Mortar and pestle Used for crushing and grinding heating in the laboratory. samples. Usually made of porcelain or glass. 38 Tirrill Burner Thermometer clamp A variation of a Bunsen burner that A clamp specially designed to contains a needle valve for gas flow hold a thermometer. regulation. (Often referred to as a Bunsen burner.) Double buret holder A double clamp for holding two Meeker burner burets. A wide top burner that produces a hotter, larger area flame than a Bunsen burner. Funnel rack Used to hold several funnels for filtering operations. Wing top (flame spreader) Wire gauze (ceramic center) A device that fits on a Bunsen burner A support surface to be used with a to produce a wide, narrow flame suitable ring support or tripod to provide for heating a glass tube for glass bending. uniform heat distribution to a flask or beaker. Ring stand support Clay triangle Consists of a heavy base with a metal Iron wire covered with pipe clay. rod for supporting apparatus for a variety Used with a ring support for supporting of laboratory operations. crucibles during heating. Also used, with a ring support, for supporting a funnel when filtering. Utility clamp Rubber policeman Adjustable clamp for holding a test tube, A rubber tip with a flattened end used on a flask, buret, or other apparatus. glass rod for scraping solids from containers. Extension clamp Water bath Used with a clamp holder, allows A metal bowl with a top of concentric more variation in positioning than a rings so that different sized glassware can be utility clamp. fit into the bath. 3-prong clamp Beaker tongs Used with a clamp holder, allows for Wide-jaw tongs for holding beakers. more versatility in holding different types of apparatus Crucible tongs Tongs with oval opening in jaws for Extension clamp holder holding crucibles. Tips used for handling Used to attach an extension clamp to a ring crucible covers. stand support or support frame. Dish tongs Support ring Jaws are made to encircle an evaporating Designed as a base support for dish with fingers to grip the top flange. beakers or flasks when heated on a ring stand support. Flask tongs V-shaped jaws are used to hold neck of flask. Spatula and scoopula For handling small amounts of solid chemicals. 39 Test tube holder Spring-type clamp for holding Spot plate a test tube. Made of porcelain or glass. Used for small scale chemical reactions Forceps and tests. For handling or manipulating small samples or materials. Petri dish (culture dish) Used for containing small samples Pinchcock clamp or chemical reactions. A clamp used to pinch rub ber tubing closed to stop fluid Well plate flow. May contain 12, 24, 48, or 96 wells. Used for microscale chemical tests Screw clamp (Hofmann clamp) and reactions. An adjustable clamp used to regulate or stop fluid flow through Water aspirator rubber tubing. A filter pump that fits on a faucet which is used to produce suction for filtering. Triangular file A metal file used for scratching glass when cutting it into smaller pieces. Pneumatic trough A device used for collecting gases Test tube rack by water displacement. Used for holding test tubes upright. May be made from wood, plastic or metal. Some contain pegs for drying test tubes. Test tube brush A narrow brush with tufted end for cleaning test tubes Beaker brush A large sized brush for cleaning beakers or bottles. Pipet safety bulbs Several styles shown. Used to provide suction for filling pipets. Some bulbs have valves to allow liquid flow from pipets. 40 .