Recrystallization and Melting Point Analysis

Now that we have covered some important separation techniques, let's take a look at a purification technique. Sometimes a chemical reaction will produce a solid, which can precipitate from solution. But these crystals typically contain impurities from solution that were trapped in the lattice as it formed. After we isolate these crystals, we can purify them via recrystallization. This is where we dissolve them in a particular hot solvent that will then retain any impurities before cooling it down such that it can crystallize again. We will also learn how to assess the purity of our recrystallized product using melting point analysis. This is neat stuff!
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Пікірлер: 56

  • @nathanmermilliod3135
    @nathanmermilliod3135 Жыл бұрын

    Perfect video and explanation of concepts, and just in time for my students’ lab practical on recrystallization. Thanks Professor Dave!

  • @23100Battlefield

    @23100Battlefield

    Жыл бұрын

    I had my lab on this three weeks ago! Wish Dave had this video earlier, you really have labs late in the term, it's our exam period rn

  • @thomaseddyson362
    @thomaseddyson362 Жыл бұрын

    Thank you. I always appreciate the effort you go to with your videos. Well presented with just enough of the required ephemera.

  • @hananehanane3860
    @hananehanane3860 Жыл бұрын

    I hope to see more techniques explanation in your channel. Thanks Prof Dave

  • @martinarenzi4744
    @martinarenzi4744 Жыл бұрын

    Thank you Prof Dave! As always so precise and clear

  • @harrybrielmann189
    @harrybrielmann189 Жыл бұрын

    very complete! And I agree that trituration (forcing the solvent out by the addition of a less soluble solvent) often results in a less pure product.

  • @cancan1231ify
    @cancan1231ify Жыл бұрын

    Hey, I have friends and roommates that work for Thermo Fischer scientific. What a fun coincidence that they sponsored one of my favorite KZreadrs.

  • @MSA_fansite
    @MSA_fansite Жыл бұрын

    I love you mr.dave you are really helping beyond imagination

  • @nicco-sixty
    @nicco-sixty Жыл бұрын

    Will you do more in-depth concepts in multivariable calculus, like the Jacobian matrix?

  • @louisnemzer6801
    @louisnemzer6801 Жыл бұрын

    My favorite organic chemistry purification method!

  • @prixynealojado6998
    @prixynealojado69987 ай бұрын

    You're my hero, Professor Dave 🫶

  • @eddielikesfish7114
    @eddielikesfish7114 Жыл бұрын

    i literally just learnt about this in chemistry lol. we are going to be making asprin with this method in january

  • @vspqrv9784
    @vspqrv97842 ай бұрын

    such a high quality video and explanation

  • @Dylan-cv7kj
    @Dylan-cv7kj Жыл бұрын

    Science is so cool

  • @triple_gem_shining

    @triple_gem_shining

    Жыл бұрын

    Moon is flat tho . Lol jk

  • @ariiibaby05

    @ariiibaby05

    Жыл бұрын

    Right

  • @markshort9098

    @markshort9098

    Жыл бұрын

    Yes, yes it is

  • @Malthusia

    @Malthusia

    Жыл бұрын

    Ye

  • @henna_nenna
    @henna_nenna5 ай бұрын

    you are saving the life of every ochem college student thank you so much

  • @similosihlegqalisisa8211
    @similosihlegqalisisa821110 ай бұрын

    I'm subscribing now Prof❤❤❤

  • @ansammkh1681
    @ansammkh1681 Жыл бұрын

    thank you

  • @rozana4470
    @rozana4470 Жыл бұрын

    When are the other videos coming cause i start OC lab this week😭

  • @Flags.crosses.trailerparks
    @Flags.crosses.trailerparks Жыл бұрын

    Fascinating

  • @TomasElizabeth
    @TomasElizabethАй бұрын

    So super cool

  • @milviodeleon4421
    @milviodeleon4421 Жыл бұрын

    Wow comments on. Good job 👍

  • @gamingwithrksaver4868
    @gamingwithrksaver4868 Жыл бұрын

    We used to do these for derivative tests... and then match the m.p. to literature value to confirm the compound

  • @missionsuccess6323
    @missionsuccess63239 ай бұрын

    . Synthesis of 2-Amino-4-(substituted-phenyl)-1, 3-thi- azole Derivatives

  • @RevilHermes
    @RevilHermes Жыл бұрын

    I remember doing much simpler version with salt.

  • @rassimsimou1594
    @rassimsimou1594 Жыл бұрын

    Good

  • @StephOnyia
    @StephOnyia8 ай бұрын

    You are a pro 😮 Including the guy in the laboratory 😊

  • @enzoshii
    @enzoshii7 ай бұрын

    Crystals did not form in our experiment. What could have gone wrong?

  • @WanderTheNomad
    @WanderTheNomad Жыл бұрын

    5:17 Why do we have to use the minimum amount of solvent? Is it just to avoid wasting it or something? Or is there another reason?

  • @keypo790

    @keypo790

    Жыл бұрын

    Its because the experiments relies on Solubility Curve.

  • @user-qe8gy1zv2i

    @user-qe8gy1zv2i

    9 ай бұрын

    its better to use the smallest amount of solvent to minimize the amount of material lost by retintion in the mother liqour

  • @TheCosmicGuy0111
    @TheCosmicGuy0111 Жыл бұрын

    Wowza

  • @krabre1848
    @krabre1848 Жыл бұрын

    hi

  • @chrisaltaawesome
    @chrisaltaawesome Жыл бұрын

    thank youuu

  • @harrybrielmann189
    @harrybrielmann189 Жыл бұрын

    it's ok if the impurity is insoluble, just filter it out while hot.

  • @harrybrielmann189

    @harrybrielmann189

    Жыл бұрын

    oh you covered that, nice.

  • @Linda-hn3bh
    @Linda-hn3bh Жыл бұрын

    👍😌

  • @livingcodex9878
    @livingcodex9878 Жыл бұрын

    おはようございます

  • @-JA-
    @-JA- Жыл бұрын

    🙂👍

  • @judeboys6409
    @judeboys6409 Жыл бұрын

    This video reminds me of being a meth head in my 20s. Wouldn’t recommend it 😂. I used to “wash” it in acetone. To clean out impurities .. Have no clue what that was doing scientifically. But it sure made you higher 😅😮. Hey Dave. What would be the science of that lol ? You probably more an idea than I

  • @desmond3828
    @desmond3828 Жыл бұрын

    immunology?!

  • @krabre1848
    @krabre1848 Жыл бұрын

    idk whats happening but cool

  • @krabre1848

    @krabre1848

    Жыл бұрын

    omg i remember this in year 7

  • @tiptop1681
    @tiptop16813 ай бұрын

    Finally i can do this with my meth. Thanks

  • @worldsfinestsimp6421
    @worldsfinestsimp6421 Жыл бұрын

    TIGHT TIGHT TIGHT

  • @kevinxavier2986
    @kevinxavier2986 Жыл бұрын

    Komenke41

  • @KasaJiso
    @KasaJiso Жыл бұрын

    First comment, day to of “do more flat earth vids they blew up.” Sorry not first I was too long to write the comment :(

  • @Gxlto

    @Gxlto

    Жыл бұрын

    Sorry man I dont think he will. It's kind of dead at this point. I hope he does more creationism debunking

  • @DavidP089
    @DavidP089 Жыл бұрын

    2 million subs and your videos barely reach 10k views 🤔🤔🤔

  • @ProfessorDaveExplains

    @ProfessorDaveExplains

    Жыл бұрын

    Learn how educational channels work, sweetie.

  • @white_isnt_a_race2338
    @white_isnt_a_race2338 Жыл бұрын

    Educate me daddy