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welcome to the left I thought we'd take a little bit a time today
to take a look at some of the lab equipment that we use
glassware and some instruments so that when you take your first lab
you'll be able to understand what the equipment is called
and some will show you a few these things and
tell you how they're used so you become familiar with the I will tell you some
other glassware
is a little confusing at first until you use to
the terminology so hopefully we'll get used to the terminals pretty quick
we're gonna start with some basic glassware another three general types of
glass where you gonna be coming in contact with
beakers flasks and Saunders it's pretty simple actually
the way you tell the difference between them
will also help you understand how they're used Soul Surfer
beakers beakers anything with
straight parallel sides it looks kinda like a drinking coupley
never wanna drink anything out here but history tells sites sometimes speaker
has numbers
on the site at a but
we only use this scale know is these numbers
to do really anything important I am
it's just to give you an idea about how much
is in they're not very active you don't really measure with speakers speakers
are used to make measurements
speakers are used just to hold stuff so you might put a liquid in here if you
want it to boil some water for example quite a bit of water you would put it in
here
speakers come in various sizes this is probably one of the most common sizes
this is a $250 million a beaker again you'll see it's got numbers on the side
but we don't use those numbers for anything I
and then they go very large and even get down to very very small this is a tiny
little
a ten milliliter beaker and its naked
it's cute so a bigger has straight parallel sides
it may or may not have numbering on it it's just use two holes
a flask on the other hand
the sides are not parallel
this site almost looks like a call and as a matter fact one of the names if it
is
a conical flask but it's more common name is
named after the scientists that created it it's called in
Erlenmeyer flask and Erlenmeyer flask
has sites that are not parallel
a slope it another way in other words the mouth
up the flask is much narrower than the base of the flask
in the case of a beaker the mouth and bass are essentially the same diameter
more or less
but flask as much an hour at the top and this prevents splashing so we often do
chemical reactions
in flasks because if there's any kinda splashing it'll usually be contained by
sites this is probably the most common size this is a 250 milliliters
Erlenmeyer flask you'll be using these
every now and then and again may get very larger they get very small this is
a 25 no leader Lemaire last but you see it's the same shape
same general side some love these may have numbers
on them but we don't we don't really measure anything other than
approximate amounts and a girl my flask if you want to measure
Beaulieu you need to use something called
a graduated cylinder many of you have seen a graduated cylinder before
it's called a graduated cylinder because it has
not only numbers but many numbers and lines
you can see those right along here numbers in lines on the site
this is what we use to measure volume
by liquids specifically it's fairly
accurate in other words we can get a pretty good idea of how much volume we
have been here if we read it correctly
there are different sizes this is a $50 bill later graduated solder we have
twenty five milliliters a little bit smaller
and we have 10 no leaders there very skinny they don't hold quite as much
and the lines are a lot smaller on a ten milliliter flask you can see how small
those lines are
attend the leader graduates on they're very small and that means that were
actually able to get a very accurate volume
a small volume but very accurate but something like this
so we have beakers flasks and graduated soldiers
graduates owners are really the only ones that we're going to use
to measure Beaulieu beakers and flasks
hold stuff but don't generally will generally measure with them even if they
have lines
some other glassware that you're going to become familiar with
you probably seen something like this and most movies about labs are you may
have actually used these before this server
course the ubiquitous test-tube
and Toorak the test tube rack that we keep them
I we need to keep them in Iraq because if you look very carefully their bottoms
around it which means they won't stand up
I put it down on the bench it'll fall right over so we often don't want them
to fall over because whatever's in might still
so we put them in Iraq to keep the lot
the test tubes are where we do small reactions
to chemical reactions in test tubes all the time tests
test is just another word for reaction of in chemistry
if we want to hold the test tube we're going to use a very specific piece of
equipment called
test tube holder this is a test tube holder
you squeeze it together like this the jaws open you can put your test tube
inside like that
and now we can hold the test tube securely
without having to actually touch the classic case or something very hot in
here or if we want to put it into a flaming
it test tube holder
test tube holder test tube rack
tested
something that people get confused
with the test tube holder in the test tube rack
these things these are called crucible tongs and they have a very unusual
and to them see they're kinda bent like that
and they have this weird serb and peace in the Middle
crucible tongs are not going to be used to pick up test tubes
up they are used to pick up things that are very hot you can hold something
directly in a Bunsen burner flame what s
with crucible tongs or you can use it to pick up something hot piece of glassware
for example
if the speaker or a little too hot to touch it small enough I can grip it by
the sites
but a crucible tongs was originally invented
to hold well its namesake crucible and crucible
is a small porcelain cup a little hat
and inside this cup we can do some heating we can keep things very strongly
as porcelain conducts he pretty well
and originally this little weird bent peace in the middle %uh
a the crucible tongs was designed to allow the crucible sit
righted unfortunately if you don't have a steady grip for you relax your hand
just a little bit it'll slip right through
and you break your crucible so when we use crucibles
we don't carry the hat around with the lid we just grab it by the sides
and that things not going anywhere it's very very secure that way so we carried
around the lab but will it be touching with her hands because it usually can be
very hot
so in carry around with the crucible talks pretty easy
so these possible times these with the rubber tips
are called beaker tiles and these are used to pick up hot
beakers usually this a lot easier than this especially for beakers
a little bit larger and full of boiling water it's gonna be very happy and it's
going to be hard to lift with crucible tongs
so is bigger tongs their padded they've got a little non-stick
or non slip rubber sleeve on each of the
the arms and Wheaten Terrier beaker like that
so we can heat liquids
in beakers we can heat solids in crucibles
week and do chemical reactions in test tubes or an Erlenmeyer flasks
what we want to eat something we keep talking about heating things how do we
keep things well
we're going to use something called a on som Bor
there's a Bunsen burner very famous
I structure here in in chemistry we use these bunsen burners to eat things all
the time
in a later video of show you how delighted properly
there's a right way to light this thing in a way that's not quite as efficient
and more difficult
so shady easy incorrectly like fun summer later on
but we keep things one summer the sender the hose get hooked up to the gas
and we light the tip right here a turn on the gas supply to
and we had a nice flame -thick get fairly hot about seven hundred degrees
or so
well I we can hold something directly old flame using one of our tongues but
sometimes we just want to let it sit especially for them to
up what water boil and so if you want to do that we're going to set up a little
structure called
a ring stand withering and some
other items might put up
so here is a ring stand
and it has this little platform-based I can often put our Bunsen burner
directly on their and then we can set something clicked something
to the stand itself
in this case I have an iron ring it clamps
right on here aka Bunsen burner right underneath it
and then if I wanna platformer something I can use for example this this is
called the wire gauze
it's made out of wire has this asbestos circle in the center that allows us to
Iraqi
evenly and I could put the wire gauze on top of the iron ring
and I get a very nice little cooktop
and then I could put my beaker on top of that and i cant heat
nicely so that's one way that I can heat things if I wanna hit a crucible
on my or up in top I can't do this but this public bodies your way and
a better way he crucible weekend use something called a
clay triangle this is a clay triangle
and that actually holds the crucible rather nicely
right in place if we wanted to keep the crucible
when it's time to light the Bunsen burner I use a spark ur
this is a spark ur to create a little spark and I can like the Bunsen burner
again you'll see this later on
when we go ahead and show you how to light the fun summer
just a couple more to do couple took the other piece of equipment that you're
going to be using
that you want to become familiar with this anytime you need to stay
take some powders or crystals out about a bigger for example or a bottle
you're going to use this thing this is called a scoop you up
it's like half scoop have spatula and so you can reach in and you can grab some
and it sorta sits right in there let's like a little school
it's it's in there and you can transfer one place to another so the school feel
is used to get solid powders are crystals
outta bottles are beakers and put them someplace where you want to use them
this looks like a giant contact lens it is in fact called a watch glass
and we can use this we can put something on there to observe it
we don't ever he a watch glass be very careful sometimes you might want to keep
this
don't keep this this Pyrex that it's made out it was pretty fragile
crack if you try to keep it if you do want to eat something in
open container that's not like a crucible
you can use the crucibles Big Brother this is an evaporating dish
and you could put something in here and you can hear it very strongly it's also
made a very strong porcelain it will keep very well
you can put it in here and it will a little evaporate
whatever liquid might be in there so evaporating dishes are better too
evaporate liquids overheat
most you probably know what this is this is called a filter funnel this is used
when we need to filter a solid out of a liquid
we put a piece of filter paper in here we pour mixture through
the solid get stuck in the filter paper and the liquid goes right on through
same general idea as a basic coffee maker
that's kind of how coffee makers work the coffee filter is the filter paper
the structure the put that filter is like the final and the mixture is the
coffee grounds in the water going through it and what comes through is
what
is dissolved what's most liquid so we use
coffee shop are filter for
just a couple more this is a glass
stirring rod it is used you guessed it
to stir its classes Pyrex actually
so it doesn't react you generally don't want to stir with metal especially if
you have assets are things that reactive metal
I use Pyrex because it's not correct
this looks like an eyedropper
is actually called a pipette and a pipette is used
well that's when I drop Oris I kept so if you wanna suck up a little liquid in
one place
and put it someplace else use a pipe that these things are disposable with
role model a time if you use and generally they get a little
30 be kept clean real well as the opening at the
at the tip there's very very small so restore about
and finally
a thermometer you're gonna need to take some temperatures occasionally
this is a thermometer now this one is a mercury thermometer we probably will not
be using mercury thermometers
even though it is coated with something so that it will break
I we generally don't like to use mercury so the ones to use will probably be
alcohol
means I have a blue or red liquid in there up still used to take tempt
soap that's a lot of equipment I
if you've just watch this video through without pausing you're gonna miss a lot
you should probably go back and
use the handout that has all the pictures
and write in their names right down maybe their structures and functions
so that you know what they do we're gonna start to need to know what these
things are
because when we do labs in the lab description ill say
take a $50 million a graduated cylinder well you need to know what to look for
if you're doing a 50 milliliter graduates or
so learn your lab equipment learn their names
when their basic functions and don't forget to the west at the end video
or seal it