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Oxidation Reduction Titration experiment — Transcript

by Chemistry with Dr. Memari · 1,889 words · 358 segments · language en · Watch on YouTube

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0:00[Music]
0:08our experiment eight
0:11is oxidation reduction reactions in this
0:13reaction we are using permanganate and
0:17sodium oxalate
0:19this oxidation reduction
0:21titration is kind of unique because if
0:24you remember from acid-base reactions we
0:27use indicator to find the endpoint of
0:29the reaction
0:30for this reaction permanganate because
0:33the purple color is going to act as
0:36indicator at the beginning when we add
0:39the permanganate oxalic acid or sodium
0:42oxalate in sulfuric acid the color would
0:45disappear so as soon as the color the
0:47pink color
0:49stays stable for like 20 seconds
0:52this top addition of the permanganate so
0:56calculation also is different for
0:58oxidation reduction because you have to
1:00be mindful of how many electrons
1:02is permanganate gaining and how many
1:06electrons is the
1:08the oxalate is is losing so when you
1:11look at the balance equation um slash
1:14when you watch the pre-lab discussions
1:16you will see the chemical reaction again
1:18today is just concentration of how we
1:20are doing the the chemical the reaction
1:24in
1:24by by practice we do the titration and
1:27you record your number for the
1:28calculations
1:30but for every five permanganate requires
1:34two oxalate ion so is oxidation and
1:37reduction permanganate is good oxidizing
1:40agent it will oxidize the oxalate ion
1:44and it will be reduced on its own so
1:47permanganate is going from plus seven to
1:50plus two oxidation number the oxidation
1:53number of the carbon is going to
1:54increase in the in the oxalate ion based
1:58on the procedure we are going to measure
2:00the mass of the
2:03sodium oxalate this is this first part
2:06of the experiment to standardize our our
2:09uh
2:10permanganate solution buret is filled up
2:13with the with the permanganate so in
2:15order to to fill up the buret first we
2:18need to wash the beard with distilled
2:20water then we condition for the
2:23with the permanganate solution i just
2:25want to let you know the steps that you
2:27must take if you were in the lab but i
2:30did them for you and i filled out the
2:32burette i washed it first conditioned
2:35and then i watched i filled out the
2:36duration to zero and that gives the
2:39initial buret reading for trial one of
2:42this experiment which you can record it
2:44as
2:460.00
2:48next we are going to measure the mass of
2:50the oxalate but for the purpose of the
2:53data sheet because it's asking for the
2:56mass of the empty erlenmeyer flask and i
2:59want you to record
3:01the mass of empty erlamer flask
3:05so record this mass
3:07as the mass of the empty erlenmeyer
3:10flask
3:11okay
3:12then i'm going to add
3:15about 0.2 grams of the sodium oxalate
3:21so this should go to
3:25120.31 almost
3:28so i would add enough
3:32i add slowly just small amount at the
3:35time to make sure that i'm not
3:37adding too much of it
3:39so we add
3:42enough to make it to
3:44128.31
3:47or in that neighborhood
3:50okay
3:52this is a mask for the flask plus the
3:56sodium oxalate please record the number
3:59again
4:02so we kind of managed to get the
4:050.2 gram exactly for this one this is
4:08for trial one
4:10we are adding
4:1150 milliliters of the deionized water
4:15based on the procedure
4:20and
4:21for this sample
4:23we are adding 10 milliliter of
4:263 molar sulfuric acid so i have the
4:29sulfuric acid i measure 10 milliliter
4:32and i'm adding to this sample so my
4:35sodium oxalate solution
4:38is ready
4:41and i can what i'm going to do
4:45because i want this to dissolve
4:46completely
4:48uh while i'm waiting for it to dissolve
4:50i want to start the second trial just
4:53preparing my sodium oxalate solution so
4:56please record this number
4:59for the empty flask
5:02for trial two
5:03this is the mass
5:05of the flask
5:06trial two empty flask trial two record
5:10this mass
5:12and i'm going to add
5:15sodium oxalate for 0.2 gram
5:18so i would
5:20go to
5:220.2 more 115.92
5:24[Music]
5:28or very close to that number
5:32as long as you record the mass
5:35exact mass of the sample you are using
5:38it doesn't have to be exact but we try
5:40to get it as close as possible okay
5:42record this mass for the mass of the
5:45flask
5:46plus the sodium
5:48oxalate for
5:50trial two so you have the
5:53the mass of the empty flask and you have
5:55the mass of the flask plus the
5:58uh sodium oxalate for both
6:00to this one also
6:02which is for my second sample for second
6:05trial i'm going to add 50 motors of
6:07deionized water
6:09just use the deionized water
6:11and measure 50 milliliters
6:14i'm going to add 10 milliliter of the
6:17sulfuric acid this is to prepare
6:20my
6:22solution for the titration i do not need
6:25any indicator
6:27this reaction does not require any
6:29indicator as soon as the powder is
6:32dissolved sodium oxalate with the
6:35sulfuric acid
6:36and the and water
6:38to dissolve we want the solutions to be
6:41hot so we hold it on the flame for
6:45about you know 30 seconds to one minute
6:47should be good enough because the flame
6:50is really high temperature and as soon
6:52as you see the steam it's good enough
6:55you don't want it to boil and now it's
6:57hot enough you're going to take it for
7:00the titration
7:03so for the titration
7:05as i said we do not need indicated
7:08initially rest reading of 0.00
7:12i will start adding
7:15permanganate solution
7:16and as i'm adding the permanganate
7:18solution
7:20okay the first drops of permanganate we
7:22are adding it disappears slowly
7:26but after that manganese dioxide forms
7:30and manganese dioxide acts as a catalyst
7:32so it kind of enhances this reaction you
7:35see that these drops are now
7:37disappearing much faster so when we add
7:40the purple permanganate it reacts it
7:43disappears it's not the endpoint of the
7:46reaction i will be adding slowly and
7:49mixing and until when i add a drop and
7:53the uh
7:54the the color would be stable for about
7:5820
7:59seconds and that would be the end point
8:01of the reaction
8:03so i'm going to
8:04to probably pause the camera for you so
8:07you don't have to wait too long for it
8:09but i will get back to you when it's
8:12closer to endpoint of the reaction
8:19okay you notice the camera was paused
8:21but i was adding now the pink color
8:25is stable for
8:26for now it hasn't been 20 seconds but if
8:29it stays for 20 seconds that's the end
8:31point of the reaction
8:32and i will ask you to record the volume
8:36this solution is colored solution no
8:38excuse you should be able to do it
8:40yourself
8:41okay
8:43record the
8:44volume
8:46for the
8:48for the burette
8:51okay
8:52i'm just holding the white background so
8:54you can record the volume
8:59this is the final viewret reading for
9:01trial one
9:03for trial two i would heat up the
9:06solution i would refill the v red
9:09because i want to make sure that i have
9:11enough solution
9:12so i go to
9:13[Music]
9:15maybe five or zero
9:20okay now that i filled up to zero i can
9:22stop at zero
9:23adjust to that zero
9:26for second trial initial buret reading
9:29also record at zero please
9:32and
9:33i'm going to heat up the solution
9:39it's not supposed to boil but it is
9:41expected to be hot
9:43i started to steam i can stop now
9:49and start adding the permanganate
9:56so first drop
10:03so it's taking longer time for the first
10:05drop to disappear because of that
10:08manganese dioxide is not there yet
10:10and after
10:12the manganese dioxide forms it does
10:15speed up the reaction so i'm going to
10:17have to
10:18to wait
10:21for it to disappear
10:23we're going to add slowly
10:25until the color disappears and then it
10:28stays permanent for
10:3120 seconds
10:33this color change is a temporary one is
10:36beginning of the reaction it does not
10:38count the first one it used about 30
10:41milliliters 31 milliliter so this one
10:44also is going to do the same you see
10:47that the color is disappearing it just
10:49took some time for the first drops
10:52to to disappear
10:54so i will be adding slowly but the
10:57camera will be paused because i don't
11:00want you you know
11:01watch very long videos
11:04but the color is disappearing
11:11okay end of the try two for
11:14standardization of permanganate
11:17you have all the information except the
11:20reading final reread reading for trial
11:23two of part a
11:25so i'm going to use white background
11:29and hopefully you can focus and see the
11:33the numbers
11:40and the number is 30.60
11:47okay 30.60 because it was hard for you
11:50to read it
11:51uh for the trial one it was 31.00
11:56about 0.4 difference in the
11:59volume
12:00okay that's the end of part
12:02a
12:03now i'm going to get ready for part b of
12:05the experiment
12:10okay now we are going to uh titrate the
12:13unknown oxalic acid basically the sodium
12:16oxalate in sulfuric acid solution is the
12:19oxalic acid we are going to titrate that
12:21with the permanganate i added 25
12:24milliliter of unknown
12:26solution or unknown solution please mark
12:29the number the leather unknown b
12:3225 milliliters 50 milliliters of water
12:36and 10 ml of sulfuric acid i heat it up
12:39and it's now hot i can start adding the
12:43permanganate i will start adding the
12:46permanganate i expect the same thing it
12:48will disappear to begin with
12:51and
12:52it would be slow at the beginning
12:55it would speed up the reaction
12:58then i have to add drop by drop
13:01as it disappears until
13:03the purple color or light pink color
13:07maintains for
13:0920 seconds at the beginning this
13:12reaction is slow but it will happen
13:15just like the other two
13:24okay for the data table you need the
13:26initial reading i started at point
13:300.00 because that's what you need for
13:32the initial
13:34buret reading of permanganate and
13:37this reaction is now started we are as
13:41we're adding a drop of permanganate the
13:43color disappears i'm going to pause the
13:46video again and i will bring you back
13:49when the
13:50pink color is stable for 20 seconds
14:10okay i guess that's
14:13that's it
14:17end point of reaction
14:21if the color stays for 20 seconds it is
14:24end point of the reaction and i will
14:26bring the
14:28curette for you to read it
14:33is stable
14:35and
14:36the burette reading
14:39is
14:4211.5 zero
14:46eleven point five
14:48zero
14:49okay
14:49that's the be retrieved eleven point
14:51five
14:54i'm going to adjust it at 12 here
14:59bring it down to 12 so i can use it for
15:02next trial
15:07initial buret reading
15:10for your next trial try to
15:13starts at 12.00
15:21okay initial buret reading
15:2412
15:26and you will add
15:28mix
15:30until it disappears
15:36first drop
15:37that's how it behaves
15:39okay very tough
16:02okay we reached the endpoint of the
16:04reaction the pink color appeared
16:07and it is stable
16:09we use almost the same amount as last
16:12time
16:15and the final buret reading is
16:2023.3 we started from 12.0 we went down
16:25to
16:2623
16:27point three so it's very similar to what
16:30we had
16:31before
16:32okay
16:33so just record the the volume that i'm
16:36saying because it might be hard for you
16:4023.3 for the volume of the fi the final
16:44buret reading for permanganate for
16:46unknown
16:48thank you
16:50[Music]

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