Full transcript
0:00[Music]
0:07experiment two part two based on the
0:10experimental procedure it says to add
0:14water in acetone so i add about three
0:16milliliters of water
0:18and
0:19i would add acetone
0:23so i have the acetone because the fume
0:26hood had makes so much noise i had to
0:29take it out of the fume hood to use it
0:31on the bench top
0:33for recording purpose
0:35so i'm going to add
0:37one milliliters of the acetone
0:40to the test tube
0:41and i want you to observe
0:44and
0:45record your observation
0:48basically what you're trying to see here
0:51if there are one layers only or two
0:55layers have
0:57so if the
0:59if the
1:01two compounds that i mix water and
1:03acetone if they are miscible if they
1:06dissolve is going to form one layer and
1:09if they don't dissolve in one another if
1:12they are not miserable it would form two
1:15layers
1:18next
1:18is
1:19water plus hexane so i would add the
1:23test tube about three milliliters of the
1:27water
1:28and
1:29i would add one milliliter of hexane
1:32following the procedure
1:34and it's best for you to read the
1:37procedure before you watch the video
1:40so you
1:41have
1:42better idea of every step what is being
1:46mixed
1:49so when you mix the hexane
1:53with water
1:55even though the line
1:58is uh it's kind of a faint
2:00line here very easy is not very easy to
2:04see but if you look closely it would be
2:06different
2:07from the other one that you had so this
2:10was the acetone with water and now i
2:12have hexane with
2:15with water you are going to describe
2:17what happened if it was miscible if it
2:20did dissolve or it did not
2:23dissolve
2:25for the next experiment or next part of
2:28the experiment i am going to mix water
2:31with naphthalene
2:34this has to do with the polarity of the
2:36compound if the molecule a general
2:40rule for solubility a polar compound
2:43would dissolve in polar
2:45solvent i know that i i know
2:49it says use 0.1
2:51[Music]
2:53gram of the sample because i did write
2:55the experiment so i do know the
2:57experiment
2:58but i'm going to use
3:00you know about 0.1
3:02as long as i don't use too much to
3:05saturate the solution
3:07with the with naphthalene
3:09it should be fine
3:11so i would just use few crystals of
3:13naphthalene two pieces of naturally
3:16shake it well and examine the solubility
3:21now
3:22for solubility of solid in liquid
3:26if the sample disappears
3:28it would be soluble if the sample does
3:31not disappear by mixing well by
3:34agitating and mixing it well if the
3:37solid does not disappear
3:40um basically is forming the two phase so
3:43please observe closely and record your
3:46observation for your lab report
3:52for the next experiment we are going to
3:55examine naphthalene again but this time
3:58we are changing the solvent we are not
4:00using water at the solvent instead we're
4:03going to use
4:05toluene which is an organic solvent
4:09it's nonpolar solvent going to use
4:12naphthalene with
4:14tolerance
4:19so that's the tolerance
4:21you treat the label it's the toluene
4:25and i would use toluene about three
4:27milliliters of toluene to add to the
4:30naphthalene
4:31and
4:32see if it's going to dissolve
4:34or not and you with the judge
4:37because you are the one recording the
4:39observation
4:42you would agitate
4:43and look for the result of the
4:45experiment naphthalene disappears
4:48it would be one phase
4:51and if it stays there
4:53there would be
4:54two
4:55okay so i'm turning it around so you
4:58could see from different angles
5:00sometimes you would think that there is
5:02solid here but in this case
5:05um i don't see any solid and you can
5:09you know record your observation okay
5:11with this background it would be better
5:13so you have
5:15the solution of naphthalene in
5:19tower
5:21for the next mixture we have copper
5:24sulfate
5:26and i did bring copper sulfate is the
5:28blue color
5:30crystals
5:32i have the container for you
5:35here
5:36and that is copper sulfate
5:40copper sulfate
5:41i'm going to add water
5:44to copper sulfate
5:49copper sulfate is ionic compound it is
5:52expected to
5:54um to dissolve in water they want to see
5:57if it gives me blue color solution or
6:00or not
6:03so i will be
6:06stirring it
6:11and checking for the color of the
6:14of the solution
6:23so
6:24copper sulfate
6:26start dissolving
6:27and uh
6:29we are going to save this
6:31for the next step of the experiment
6:35and i can show you like in a
6:37in a while
6:39for complete disappearance
6:41of the
6:43of the solid
6:46but you see the blue color solution that
6:48is being
6:50formed
6:52for the
6:53next step
6:55we have
6:56copper sulfate mixed with
6:59silicon dioxide or sand
7:02and we are going to separate that
7:06i have to
7:07use some techniques for separation here
7:10because
7:11copper sulfate you see here it dissolves
7:15in water but sand is not going to
7:17dissolve in water
7:19so what i'm going to do in this
7:22next part of the experiment i take the
7:25mixture of the copper sulfate with the
7:27silicon dioxide i place in a beaker
7:31and as i add water
7:34the blue color solution is forming at
7:37the same time if you look at the bottom
7:39of the beaker
7:40there are pieces of the sand that nobody
7:43is going to
7:45to dissolve
7:46so to separate this i'm going to have to
7:50use uh gravity
7:52filtration which i need to set it up but
7:55i'm going to wait for a couple of
7:57minutes for the copper sulfate to
8:00dissolve completely and what i have as
8:03the solid would be only sand so there
8:06should be no blue color
8:09precipitate or solid everything should
8:11dissolve before i start my
8:15separation
8:27i want to set up gravity filtration as
8:31one of the technique that is used in
8:33general chemistry and also in organic
8:36chemistry but for
8:38setting up the
8:40gravity filtration we are going to use
8:43small ironing
8:46to attach to ring the stand this is a
8:48support for a glass funnel that we are
8:52using for our for the filtration
8:56now
8:56to prepare the
8:59filter paper
9:00i take one large filter paper
9:03i fold the filter paper in half
9:08fold it in half again
9:10for second time side fold it in half
9:13first
9:14i fold it in half again second time
9:17then i open it
9:19one part to one side three parts to the
9:23other side
9:24but i don't want to happen like if
9:27someone to fold is like this and it's
9:29going to make a hole like
9:31those
9:32crystals or precipitate is going to pass
9:34through
9:35so what you need to do
9:37after you fold it twice one part in one
9:40side three parts on the other side you
9:43basically made a paper funnel you place
9:45it in the clasp in the glass funnel see
9:48it's not staying still and in order for
9:51this to stay still
9:53i'm going to add few drops of water
9:56when i add some water
9:58to the filter paper
10:01the filter paper is going to stay still
10:05we are doing filtration so we want to
10:07separate the solid from the liquid we
10:09want the solid to go on the filter paper
10:12and the liquid would pass through the
10:14filter paper
10:16so i'm going to pour the mixture through
10:19the filter paper
10:20and because i want to transfer both of
10:23them through the to the filter paper i
10:26can mix it
10:27so to make sure that everything would go
10:29otherwise the solid piece especially in
10:32this case that we have sand for this
10:35part of the experiment with sand and
10:37copper sulfate the sand is heavy and
10:39it's going to stay in the beaker so
10:42we are mixing it agitate mix and then
10:46add to the filter paper
10:48store it well and add
10:51and if
10:53you have leftover
10:55in the beaker leftover of solid in the
10:57beaker keep adding the solvent that you
11:01were using
11:03and pass it through the filter paper to
11:06make sure that everything is going to be
11:08transferred to
11:10filter paper
11:11now
11:12with this
11:13we have separated the
11:15solid from the liquid
11:18liquid portion nav is in the beaker we
11:20have a solution of copper sulfate
11:23it's a blue color solution in the copper
11:25in the beaker
11:26and the span is on the filter paper
11:30now if you were going to
11:32recover this major mass or the procedure
11:35ask for further
11:37steps
11:38you can take it out of the
11:41filter paper take the filter paper out
11:43of the funnel
11:45place it and watch glass let it air dry
11:48then you have dry sand
11:50for this liquid it can be evaporated and
11:54then you end up with the copper sulfate
11:56because that's the separation technique
11:58or physical means for separation
12:01technique
12:03[Music]
12:10you