So, i am going to separate a mixture that contains an organic acid, an organic base, and a neutral compound using acidbase extraction.Specifically, i will dissolve a mixture that contains benzoic acid, pbromoaniline, and phenanthrene in dichloromethane, and then throw it into a separatory funnel.Then i will add a solution of hydrochloric acid, which will convert the pbromoaniline into it's hydrochloride salt, which can then be removed in the aqueous layer.Once that's removed, i will throw in a solution of sodium hydroxide, which will convert the benzoic acid into a sodium salt, which can then also.
Be removed in the aqueous layer.Once the three compounds are separated, i will convert them all back to their neutral solids.Benzoic acid is corrosive.Phenanthrene is an irritant.Pbromoaniline is an irritant.Dichloromethane is toxic.Here i have a one to one to one by mass mixture of benzoic acid, phenanthrene, and pbromoaniline.I going to dissolve the mixture in ten milliliters of dcm or dichloromethane.I am going to add the solution to a separator funnel.Next, i am going to add approximately five milliliters of three molar hydrochloric acid.Two layers are noticeable.I am going to cap the sep.
Funnel and shake it to mix the two layers so the pbromoaniline that is in the dcm layer will come in contact with the hcl and cause protonation.The pbromoaniline hcl salt will then migrate to the aqueous layer.I will vent it so the pressure does not build up too much.Shake some more, vent again, shake one more time, and vent one more time.To be safe, i am going to add a few more drops of dcm and watch where they go so i know which layer is the dcm layer and which layer is the aqueous layer.You can see the drops fall.
To the bottom.This makes sense because dcm has a greater density than water and is usually the bottom layer.So i am going to label this bottom flask with an n , which will be the neutral, organic, dichloromethane layer.And now i will just drain off the bottom layer being careful not to get any of the top layer.I am going to label a second flask a.E., which will be the acidic extract or aqueous layer containing the hcl and the pbromoaniline salt.I will drain the solution into the flask, close the sep funnel, and add back the neutral.
Dcm layer so i can extract it one more time to make sure i get all the pbromoaniline out of it.I will add approximately another five milliliters of three molar hcl, cap the sep funnel, shake it, vent it, shake it, vent it, drain off the bottom, neutral dcm layer, and then collect the top aqueous acidic extract layer.I will pour back the neutral layer that should no longer contain pbromoaniline, but still contains benzoic acid and phenanthrene.To remove the benzoic acid, i will add approximately five milliliters of three molar sodium hydroxide.
I will shake the sep funnel to facilitate the deprotonation of benzoic acid by sodium hydroxide, forming ionic sodium benzoate which will migrate to the aqueous layer.And as before, just to be safe, i will add a few drops of dcm.The dcm as expected is the bottom layer.I will label a new flask b.E.For the base extracted aqueous layer.First though, i will drain off the bottom, neutral dcm layer, and then collect the base extracted aqueous layer.I will close the sep funnel and pour back in the neutral dcm layer, then extract.
It one more time with approximately five milliliters of the three molar sodium hydroxide solution.You can sort of see two layers on the sides of the sep funnel, but not in the middle.I'm going to add some more three molar sodium hydroxide to see if i can get the layers to be more noticeable.Now i will drain off the bottom, neutral dcm layer and then collect the second portion of the base extracted aqueous layer.So now all three compounds should be separated.The acidic extract should have the pbromoaniline.
Hydrochloride salt.The basic extract should have the sodium benzoate.And the neutral dcm layer should still have the phenanthrene.So now i need to turn them all back into the neutral solids they once were.I'm going to add anhydrous sodium sulfate to the neutral dcm layer to absorb any water that may be present.You can tell enough has been added when you can swirl it around and its not all completely clumped together.I will set this aside for now.Next, i will add six molar hcl solution to the basic extract, which will protonate the sodium benzoate,.
Converting it back to the benzoic acid.I will monitor the ph of the solution to ensure the protonation occurs.Right now the basic extract has a ph of about 10 and the six molar hcl has a ph of about 2.I will know the protonation is complete when the basic extract also has a ph of 2.I will grab some ice to cool the basic extract before the addition of the hcl solution since some sodium hydroxide is also present and to minimize the solubility of the benzoic acid.For similar reasons, i will also start cooling the acid extract and some.
Distilled water to help during transfers.I will add some of the hcl solution, and then take the flask out of the icewater bath so it can be seen easier.Formation of benzoic acid as a white precipitate is noticeable.After adding approximately five milliliters of the hcl solution, i will now test the ph, which is the same as the hcl solution and confirmation that all of the sodium benzoate has been converted to benzoic acid.I will collect the solid using vacuum filtration.I will wet the filter and attempt to transfer.
As much of the benzoic acid as possible.I will then rinse the flask a few more times and then leave the solid to dry on the vacuum for awhile.When it's dry, i will collect it on a watch glass and record its mass.Similar steps are used to convert the pbromoaniline hcl salt back to the free base form.In this case, six molar sodium hydroxide is used instead of the six molar hcl and when addition of the sodium hydroxide solution is complete, the acidic extract should have a ph of about 10.
After at least ten minutes of drying with sodium sulfate, the neutral dcm extract, which should still contain phenanthrene, can be transferred to a beaker, leaving behind the solid sodium sulfate and the excess water it absorbed.The dcm may uncontrollably drip out of the pipe.To prevent this from happening during transfer, it can be sucked up a few times to equilibrate the inside of the pipet before attempting to transfer it.To prevent any of the sodium sulfate from entering the pipet, positive pressure can be applied to the pipet bulb until it reaches the very bottom of the flask.To ensure i did not leave behind.
Any of the phenanthrene, i will rinse the flask with a few more milliliters of additional dcm and then transfer that as well.Next, i will evaporate the dcm solution on a hotplate in a sand bath.Instead of a boiling chip, i will add a wood applicator stick.Dcm has a low boiling point at forty degrees celsius.To prevent burning the solution when there is only a little bit of it left, i will make sure it is no longer in direct contact with the sand.I will also let the very last of it evaporate on its own at room temperature.
And increase its surface area by rolling it around a few times in a beaker.I can then scrape it from the beaker to a watch glass and when its completely dry, record its mass.I started with 520 milligrams of the mixture.I ended up with 100 milligrams of pbromoaniline, 107 milligrams of benzoic acid, and 145 milligrams of phenanthrene.So the percent recovery was 68 percent.This value makes sense because i lost some of it during transfers.The highest recovery for phenanthrene may be due to its greater tendency to always stay within the.
The Sci Guys Science at Home SE2 EP4 Red Cabbage pH Indicator Acid Base Indicator
Today on sci guys acidbase indicators ltltintro musicgtgt welcome to sci guys i'm ryan and i'm adam and today we're going to be making an acidbase indicator using red cabbage.Purple cabbage! its called red cabbage.It's purple.It's name is red cabbage.Purple cabbage.An acidbase indicator is a solution that changes color in the presence of an acid or base it can be a sudden change at a specific ph or a gradual change through many colours as the ph changes the equipment you need for this experiment includes a couple of glasses,.
A blender, coffee filters, and a funnel.We're also going to need a few ingredients from the fridge and pantry.The items we need from the pantry are baking soda, vinegar, and distilled water.The ingredients we need from the fridge include lemon juice and a red cabbage.The last two items we need are ammonia and antacid taps.The safety equipment we're gonna need today includes gloves, goggles, and an apron or lab coat to protect from spills or splashes.Also, since we're dealing with hot water and sharp objects make sure you have adult supervision.
So the first step for our experiments is to add four cups of warm distilled water to our blender.Next we add two red cabbage leaves.Put the lid on securely.Holding the lid and give it a few pulses.Ltltblender soundsgtgt the second step in our experiment is to take your coffee filter and your funnel and place the coffee filter inside the funnel.This will help prevent any small pieces of cabbage from getting into our solution.Place your funnel and coffee filter over top of another container and pour your blended solution.
Through the coffee filter.Make sure to take any large pieces of cabbage out before you start this filtration process.The third step is to take your cabbage solution and pour it into several different glasses.Make sure to leave enough room for the rest of the liquid we will be adding to test for ph.The first solution we're gonna test is ammonia.When ammonia is added it turns our solution a green colour.Which indicates that it's a strong base.The second solution we're gonna mix with the indicator is a little bit of.
Distilled water mixed with baking soda.The baking soda turns the indicator blue which tells us that it's a weak base.The next solution we gonna add to our indicator is tap water.Tap water turns our solution a very slight blue color but it still looks like a shade of purple.This tells us that the tap water that we tested is slightly basic but close to neutral.The fourth item up for testing are antacid tabs.When we add a tablet or indicator carbon dioxide is produced and because carbon dioxide is acidic.
The colour changes to maroon.This is not the end for color change.Once our solution is done fizzing the other ingredients in our tablet cause the ph for our solution to shift slightly towards a neutral ph which changes the color slightly purple.Vinegar is our next solution that we're gonna be adding to our indicator.When we add vinegar to our solution it turns a very bright red or pink colour.This colour change means that vinegar is acidic.Solution number six that will be testing is lemon juice.Lemon juice turns our solution a bright red or pink color.
Which means that lemon juice is also an acidic solution.Let's look at this experiment a little closer.First let's look at what ph is.Ph is a scale that we use to measure acidity.The lower the number is on the scale the more acidic the solution is.Water is a neutral solution and has a ph of around seven.Vinegar which is one of the most common household acids has a ph of 2.2.Ph is determined by the number of hydrogen and or hydroxide molecules a solution has.One of the ways that scientists.
Determine the acidity of an unknown solution is with a ph indicator.There are many different kinds of indicators but what they all have in common is they all change colour based on the ph of a solution.The natural pigment present in red cabbage is called anthocyanin and is an example up an indicator.These indicators show the ph of a solution by changing colour.Now the colour of an object that we see depends on the shape for the molecules the object is made of.White light contains every colour in the rainbow.
And each colour has a different wavelength.Molecules of different shapes reflect and absorb different wavelengths of light.The wavelength of light that reflects off a molecule is the one that reaches our eyes and that determines what colour we see while all other wavelengths are simply absorbed.When we add an acid to our red cabbage solution.We flood it with hydrogen molecules which causes the indicator to change shape and reflect red wavelengths making the solution look red.If we add a strong base there is instead a high amount of hydroxide molecules causing the shape the indicator.
To change colour and reflect green or yellow light.Solutions that are only slightly acidic or basic will change the colour the indicator two shades of maroon or blue respectively.The really neat thing about a cabbage indicator is that the shape of our molecule is reversible so we alternate adding acids and bases the colour can continue to change back and forth provided you don't add a strong solution such as bleach that will eventually destroy the pigment completely.Well that's it for acidbase indicators i hope you enjoyed it.
If you like this episode subscribe to us for future updates and let us know in the comments below.You can also find us on facebook and on twitter and if you have any questions related this episode or about science in general let us know in the comments below or message us on facebook will try to help you as best as possible.Thanks for watching.Bye.Bye.A magic little purple cabbage.Oh! you got me saying it now.Here at sci guys we're always curious how experiments turnout.
Acids And Bases Differences And Definition
Acids and bases differences and definition,The best and the biggest channel for science tutorials for kids kids can learn about acids and bases in this educational tutorialthis is an animated lesson for. Acidic foods vs alkaline foods,Thank you for watching as an extension of my previous tip tutorial on alkaline water watch here swatchvtxqinry4xc i. Properties of acid and alkali 3d animation chemistry tutorial education,Properties of acid and alkali 3d animation chemistry tutorial education all alkalis have a ph greater than 7 and make hydroxide ions in water all alkalis will.
Titration using phenolphthalein,For those who have not noticed the previous comments about the accuracy in the tutorial this tutorial was made as a quick guide for one of my classes about what. The sci guys science at home se2 ep4 red cabbage ph indicator acid base indicator,Welcome to the fourth episode of season 2 of the sci guys in this episode we will be creating a ph indicator acid base indicator using red cabbage then we.
Lead acid car battery to alkaline rechargeable battery conversion over 1 year later update,Lead acid car battery to alkaline rechargeable battery conversion update over 1 year later here is the first battery tutorial diy link below.
Alkaline diet when science is not enough,Is the alkaline diet for real yes discover the 5 powerful reasons why you should green up your diet grab the full transcript here.
Understanding Acid Alkaline And The Many Myths On PH
Understanding acid alkaline and the many myths on ph,Find your body type bodytypequiz how important is maintaining the acidity in your body dr berg explains what ph level means in your body and. Aqa unit 2 chemistry acids bases and salts lesson 1 introduction to acids and alkalis,Free gcse and a level tutorial lessons. The alkaline myth hype the acidalkaline truth exposed,Markusnews dont drink alkaline water until you watch this learn the truth behind the big alkaline hype and learn why acids are not bad in fact.
Acidbase reactions in solution crash course chemistry 8,Last week hank talked about how stuff mixes together in solutions today and for the next few weeks he will talk about the actual reactions happening in those. Are you acid or alkaline nerdy science project,How to test your bodys alkalinity with ph test strips perfect alkalinity is in the 7365 range disease cannot exist in an alkaline environment. Minister enqi ends alkaline acid diet alkaline water debate apologizes to dr sebi and usha village,For donations products services books classes clothes 40dayfruitfast minister enqi ends alkaline acid debate apologizes to dr sebi and usha village.
Lemon water why is lemon water alkaline,Learn more about the many wonders lemon water can do for youenergiseforlifewordpress20060210lemonwateralkalisingsuperstar. Alkali metalsbrainiac open university and francium clips,3 cool clips brought together with loser by beck intro group one alkali metals reacting with water. Alkaline acid ph balanced diet explained,Thealkalinemovement for more information on alkalinity check us out on facebook at facebookthealkalinemovement.
Acidic Blood Vs Alkaline Blood
Acidic blood vs alkaline blood,This is a tutorial of dr vegas research on goji this is amazing proof that when taken in the right amounts goji takes effect within 48 hours. Acids bases and salts cbse class 10 x science chemistry,This is the tutorial of class 10 acids bases and salts topics covered in this tutorial are as follows acids and bases strong and weak concentrated and dilute. Coca cola milk experiment cool science experiments with coca cola by home science,Coca cola milk experiment cool science experiments with coca cola by home science coca cola vs coca cola zero youtubeobzvn9flx4q the.
Ph alkaline diet prevents heart disease heals cancer naturally,Ph alkaline diet prevents heart disease heals cancer naturally when dr robert young revealed his breakthrough research on an alkaline ph and its effects. Reaction explosion of alkali metals with water,The song is called android by kraddy heres the link swatchv2igzvvtfa0 pls stop asking about it in the comments do not try. All about that base no acid,Support a capella science on patreon patreonacapellascience buy this track.
Science for kids colour changing cabbage experiment experimental 17,Make a beautiful colour changing liquid from cabbage juice and explore the science of indicator solutions in this fun chemistry experiment for children. Acids and alkalis introduction and indicators grade 7,Acids and alkalis introduction and indicators grade 7. Basics of ph iitutor,Siitutor learn the words acidic alkaline basic and neutral you will learn to look at ph charts how ph is measured examples of everyday life.