Chem 105 lab final
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| anayltical balance precision | 0.001g`
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| top loading balance precision | 0.1g
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| procedure for anayltical balance | close door, empty pan. tare, place object on pan, close door, wait for star, record to 0.001g
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| procedure for top loading balance | place empty weighing container on balance pan, tare to obtain zero reading. carefully add chemical to container. read mass to 0.1g once units stable
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| buret sig fig | 0.1mL
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| how to clean a buret | stored with distilled water.remove water, if no droplets form its clean, if not wash with detergent
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| how to fill buret | rinse 2-3 times with liquid to be contained. drain through tip, make sure to rotate so that liquid goes all around inside. then fill slightly above 0 mark. open stopcock, drain to waste beaker to fill tip. no bubbles.
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| how to use buret | wait 15s for liquid to settle. buret should be read to 2 decimal points! once done tranfering, close stopcock, take final buret reading.
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| hwo to use litmus paper | take glass stirring rod and dip into solution. touch this to litmus paper
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| red litmus turned blue | basic
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| blue litmus turns red | acidic
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| what is decanting | seperating ppt from supernatant.
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| what is washing ppt | add small amount dionized water, stir with stirring rod, centrifuge and decant
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| glassware for holding/transferring | beaker, grad cylinder, Erlenmeyer, graduated pipettes
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| glassware for measuring/tranferring | volumentric flask, volumentric flask, burettes
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| percent yield | (moles/moles) obtianed///// (moles/mass) product expected *100%
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| how to use spectrometer | make sure correct wavelength. empty cuvet set 0% transmittance. deionized water cuvet,set 100% transmittance. remove. place sample in cuvet, record value.
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| What is volumetric flas used for? | making a solution whose concentration (eg. molarity) must be known to high precision.
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| precision of volumetric flask | 4 sig figs
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| pipette use | transfer liquid of known amount
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| volumetric pippete | deliver fixed amount
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| measuring pipette | calibrated so that any volume up to max can be delivered
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| volumetric pipette precision | 2dp
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| volumetric pipette procedure | draw liquid to calibration mark, remove suction unit, and place finger.
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| which pipettes can be blown out? | frosted tip
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| reaction rate depends on what factors? | 1. concentration of the reactants
2.temperature at which reaction occurs
3. pressure of a catalyst
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| zero order reaction | 1. straight line of [A] vs time
2. slope of best fit equals neg rate constant(-k)
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| first order reaction | 1. straight line of ln[A] vs time
2. slope of best fit equals neg rate constant (-k)
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| second order reaction | 1. straight line of 1/[A] vs time
2. slope of best fit equals pos rate constant (k)
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| vitamin c, ascorbic acid is a ? | acid, proton donor
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| what is an endpoint | point at which the colour of the indicator just changes colour.
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| why water is slightly acidic? | dissolved CO2
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| phenophalin changes from clear to pink when? | presence of basic solution
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| how to use pH meter? | raise electrode out of storage buffer. rinse dh20, and kimwipe. press cal, yes. place into standard pH 7, when ready light appears, yes, rinse kimwipe. same for 4.00 pH soln. place into unknown. done, place electrode back storage buffer
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| What is electrochemistry | study of the relationship between chemical change and electrical work.
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| electric current | when a charged particle moves, called electrical current.
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| oxidation | chemical loses electrons
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| reduction | chemical gains electrons
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| lab 1 | mg ribbon with water and HCl to form H2 gas
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| lab 2 | excess of sodium hypochlorite (bleach) to solution of coloring agent.
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| lab 3 | titrimetry. -method for determining quantities. standardization of NaOH. fill buret with naoh , erlenmeyer has khp and phenophalin. same with ascorbic acid .
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| what is the primary standard in lab 3? | KHP
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| what is standardization? | process of using a standard to find the precise concentration of another solution .
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| lab 5a | buret has NaNO3 and is adding to K2CrO4.
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| lab 5b | Zn/Sn anode, Cu/Ag cathode.
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| units rate constant 0 order | M/S
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| units rate constant 1st order | s-1
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| units rate constant 2nd order | m-1s-1
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