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before the symphysis happening we kind
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of using a technique that is kind of
00:00:05
similar to what we did last week with
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the phenol red so remember last week we
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had we added four no red and we weighted
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electrostatically charged her
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we added phenol red and we bubbled
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carbon dioxide through it right and what
00:00:25
color did it change when we bubbled co2
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through it yeah low now you know it may
00:00:29
I love they're very good excellent
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because when you bubble co2 through you
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a little red remember mostly finola it
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is mostly water you're gonna get
00:00:38
carbonic acid produced and the carbonic
00:00:41
acid does what to the ph it drops it and
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this is a pH indicator it turns yellow
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under acidic pH how does it say again
00:00:53
phenol right yeah so I'm gonna add the
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phenol red to the tube first now this is
00:00:58
not seven your aspiration I'm just
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reminding you of what we did was sell
00:01:02
your aspiration last week but this week
00:01:04
we're doing photosynthesis okay so well
00:01:08
we're using the same solution but for a
00:01:10
different purpose okay I need to give
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the plant co2 see from that formula on
00:01:20
the screen co2 water and light energy
00:01:24
this light now will induce
00:01:27
photosynthesis so this plant needs co2
00:01:33
where is the co2
00:01:37
where's the co2 did anybody bring the
00:01:40
co2 with him say yeah so what am I gonna
00:01:45
do that's what these straws are for
00:01:48
right
00:01:48
that's my sick joke
00:01:52
I like to use these paper towels for
00:01:56
safety purposes there's no watch we used
00:01:59
to have students do this until we
00:02:03
started losing students no just kidding
00:02:05
but what happens with students is yeah
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see how did you guys they you have to
00:02:11
put the straw in here and the whole idea
00:02:13
is that you're gonna blow out the co2
00:02:15
from your cellular respiration right and
00:02:19
they for some weird reason that's draw
00:02:22
straw
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I'm drinking you don't want to drink
00:02:25
this one if you want to see the exam
00:02:27
three and on top of that I have these
00:02:32
students who are like they label they
00:02:34
like my son they'd love to create
00:02:36
bubbles my son always does that he
00:02:38
orders coke or whatever and he doesn't
00:02:41
drink it oh you're not drinking that
00:02:45
after that so you don't want to create
00:02:47
bubbles with that one because the first
00:02:49
person we did that got it all over all
00:02:52
over them so we have that I developed
00:02:56
this actually as a safety by the way
00:02:59
students cannot do this anymore
00:03:02
we the higher up you became Donna they
00:03:05
can't do this anymore we had a cat it
00:03:07
may be losing students every semester
00:03:08
there right so it's a professor who does
00:03:10
it you want me to drink don't you
00:03:14
that's one way to get out of the exam
00:03:17
throw you right I don't drink this
00:03:20
because I always will do this by the way
00:03:22
I put this paper towel here in case I
00:03:23
splash it it goes on the paper not me
00:03:26
okay so I do this I have a straw but
00:03:33
this time I'm blowing out I'm not
00:03:35
drinking I'm not drinking I'm not
00:03:37
drinking
00:03:40
what color what color will it turned
00:03:44
into I think I can just the same straw
00:03:57
should be no problem again I like to put
00:04:02
this on here so in case I go crazy with
00:04:04
it and it blows up in my face it goes on
00:04:07
the paper towel okay I just make sure
00:04:09
it's sitting right here all right
00:04:21
there you go that's a late response
00:04:24
that's fine okay well you don't want
00:04:31
that been anything like a solution in
00:04:33
the lab you need to wear gloves and all
00:04:35
that and if you do get it on here so you
00:04:36
just watch it it's not gonna like as
00:04:38
soon as you get on the skin you die
00:04:41
that's more like cyanide all right not
00:04:44
this guy all right so I'm gonna put in
00:04:49
man I have a lot of co2 do I yeah I got
00:04:53
a lot of it so do you so I'm gonna put
00:04:55
in one of these at least
00:05:02
into one of them
00:05:09
the other one will not get the plant so
00:05:13
what's this one behaving at that control
00:05:16
very good no that's where they live
00:05:23
that's what this one does that it's
00:05:25
designed for that perfect good question
00:05:27
now all right so I put this beaker in
00:05:30
the middle full of water because it's a
00:05:32
heat sink you don't want to heat up the
00:05:34
plant see if I do this it's this then I
00:05:37
heat up and so this actually absorbs the
00:05:40
heat what you're trying to send to the
00:05:42
plant is the light not the not the heat
00:05:44
right there's the setup so what's your
00:05:49
prediction after whatever half an hour
00:05:51
so what color will this become the one
00:05:54
with the plan it'll turn back to what
00:05:58
red red explain why Lord sucks because
00:06:01
of because it will be releasing you know
00:06:06
yeah yeah I heard it I heard it heard it
00:06:09
heard it because it's using up the co2
00:06:11
that I put in there right so I put the
00:06:15
co2 in there now I started
00:06:17
photosynthesis for the synthesis co2 is
00:06:20
a reactant the plant now is taking the
00:06:24
co2 out of the solution the co2 that I
00:06:26
put in there that caused the solution to
00:06:28
the come yell oh right but now the plant
00:06:31
is using consuming the co2 so the pH is
00:06:35
going to go back what back up and the
00:06:39
solution will turn back to red so our
00:06:43
prediction is that if this plant carries
00:06:45
out photosynthesis the color of that
00:06:47
solution will should turn back to round
00:06:49
we'll see 20 minutes maybe thank you
