Tools of the Trade Key PDF

Test Tube Do’s: holding small quantities of liquid or solid Don’t: measure volume Tips: comes in many sizes, not the best for mixing or stirring Test Tube Rack Do’s: holds test tubes Don’t: put hot test tubes on rack, allow to cool first Tips: some have poles poking...

Test Tube Do’s: holding small quantities of liquid or solid Don’t: measure volume Tips: comes in many sizes, not the best for mixing or stirring Test Tube Rack Do’s: holds test tubes Don’t: put hot test tubes on rack, allow to cool first Tips: some have poles poking up to put test tubes upside down to dry Test Tube Holder Do’s: holding/transferring a test tube usually while heating Don’t: squeeze while holding Tips: can get hot while heating test tube, hold near end Test Tube Brush Do’s: cleaning a test tube Don’t: push too hard Tips: comes in many sizes, choose one that is snug to test tube and no metal hitting glass Beaker Do’s: observing, heating, and mixing chemicals Don’t: measure volume, not accurate Tips: comes in many sizes, plastic and glass (borosilicate) Erlenmeyer Flask Do’s: observing, heating, and mixing chemicals Don’t: measure volume, not accurate Tips: comes in many sizes, plastic and glass (borosilicate) Watch Glass Do’s: observing/holding small amounts of liquid or solid Don’t: Tips: can be used on top of beaker to contain odors, many sizes Graduated Cylinder Do’s: measuring volume Don’t: heat Tips: comes in many sizes with different volumes, use smallest that fits volume needed Scoopula Do’s: transferring small amounts of a solid Don’t: heat Tips: usually used at the balance Spatula Do’s: transferring very small amounts of a solid Don’t: heat Tips: usually used at the balance  Beaker Tongs Do’s: transferring hot beakers Don’t: crucible Tips: make sure you have a tongs - good grip before picking up crucibles and raising the beaker small items Balance (Scale) Do’s: measuring the mass of objects Don’t: put hot items on it Tips: make sure it says zero before placing items on it, raise cover first Rubber Stopper Do’s: sealing containers Don’t: heat glassware with a stopper in it Tips: lots of sizes, some have holes for tubing Pipet (Pipette) Do’s: transferring/measuring small amounts of liquids Don’t: contaminate solutions, rinse between uses Tips: lots of sizes, some have graduations, plastic Weigh Boat Do’s: holding small amounts of solids for weighing Don’t: heat Tips: different sizes and styles, Ring Stand Do’s: holding different kinds of equipment Don’t: Tips: Hot Plate Do’s: heating things Don’t: touch when hot Tips: assume the hot plate is hot, it could have been left on, items on hot plate will be hot Bunsen Burner Do’s: heating/burning things Don’t: fire hot Tips: be careful that items don’t fall into flame, the hottest part is the top of the blue section Stirring Rod Do’s: stirring/mixing solutions Don’t: let them roll off the table Tips: some have a rubber “policeman” which acts like a kitchen spatula Utility Clamp Do’s: holding items Don’t: overtighten on glass objects Tips: attaches to ring stand, lots of different styles Thermometer Do’s: measuring temperature Don’t: let it roll off table Tips: collect Celsius and NOT Fahrenheit, store upright to avoid bubbles in liquid Volumetric Flask Do’s: precisely measuring volume, making solutions Don’t: Tips: used for one specific volume and no other, lots of sizes