The Sci Guys: Science at Home - SE1 - EP6: Crystallization of Alum - How to Grow Alum Crystals

00:05:35
https://www.youtube.com/watch?v=ojpCexbhxdU

Sintesi

TLDRIn this episode of the 'S Guys,' Ryan and Adam guide viewers through the process of growing crystals at home. They explain crystallization, where a solid crystal precipitate forms from a solution. Required materials include a glass or beaker, fishing line, a popsicle stick, and alum, a common pickling ingredient. The experiment involves dissolving alum in boiling water, allowing a seed crystal to form over time, then suspending this seed in a saturated solution to grow into a larger crystal. The concept of solubility plays a crucial role, as it changes with temperature, affecting crystal formation. The hosts encourage viewers to submit their experiment results and seek advice if they face challenges in their scientific pursuits.

Punti di forza

  • 🧪 Learn how to grow a crystal using alum and hot water.
  • 👨‍🔬 Wear safety gear like goggles for protection.
  • 🌡️ Temperature affects the solubility of substances.
  • 🔍 Seed crystals help in forming larger crystal structures.
  • 💡 Solubility decreases as the solution cools, leading to crystallization.
  • 🧩 Different substances form crystals of different shapes.
  • 📈 Super saturated solutions facilitate crystal growth.
  • 🔄 Repeat heating and cooling for optimal crystal growth.
  • 🧠 Science experiments can be done at home safely.
  • 📸 Share your experiment results by submitting videos.

Linea temporale

  • 00:00:00 - 00:05:35

    In this segment, Ryan and Adam, the hosts of S Guys, introduce the concept of crystallization, which can occur naturally or artificially to form a solid crystalline precipitate from a solution or melted substance. They outline the materials needed to grow crystals at home, including a glass or beaker, fishing line or thread, a popsicle stick, a coffee filter, boiling water, and alum. They begin the experiment by creating starter crystals from a solution of hot water and alum, emphasizing safety with lab coats and goggles. The process involves dissolving alum in hot water until saturation, covering the solution to cool, and using the formed seed crystals to grow larger crystals.

Mappa mentale

Video Domande e Risposte

  • What materials do I need to grow crystals?

    You need a glass or beaker, fishing line or thread, a popsicle stick, a coffee filter, boiling water, and alum.

  • How long does it take for crystals to form?

    It can take a few hours to a few days for the initial seed crystal to form.

  • What is the role of temperature in crystallization?

    Higher temperatures increase solubility, allowing more alum to dissolve, creating a supersaturated solution. As it cools, the solubility decreases, causing the alum to crystallize.

  • Can I use any type of alum for this experiment?

    Yes, cooking alum available in grocery stores is suitable for this experiment.

  • Is it safe to grow crystals at home?

    Yes, the materials used are not particularly dangerous, but it's advised to wear protective gear like a lab coat and goggles.

  • Why do we need a seed crystal?

    A seed crystal provides a surface for alum molecules to attach, fostering the growth of a larger crystal.

  • How do I ensure the crystal does not touch the bottom or sides of the solution?

    Suspend the crystal in the middle of the solution using a popsicle stick.

  • What should I do if crystals form on the bottom of the glass?

    Reheat the solution and dissolve the crystals again, optionally adding more alum to encourage further growth around the seed crystal.

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Sottotitoli
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Scorrimento automatico:
  • 00:00:00
    today on S guys
  • 00:00:15
    crystallization hey I'm Ryan I'm Adam
  • 00:00:17
    and we're the S guys on today's episode
  • 00:00:19
    we're going to be showing you how to
  • 00:00:20
    grow your own Crystal you require
  • 00:00:22
    additional pilot yes commander I shall
  • 00:00:23
    obey who are you talking to No One
  • 00:00:27
    crystallization is a natural or
  • 00:00:28
    artificial process of forming a solid
  • 00:00:31
    crystalline precipitate out of a
  • 00:00:33
    solution or melted substance the
  • 00:00:35
    equipment you're going to need for this
  • 00:00:36
    experiment is a glass or Beaker some
  • 00:00:39
    fishing light or thread a popsicle stick
  • 00:00:42
    a coffee filter and the only ingredients
  • 00:00:44
    you're going to need are boiling water
  • 00:00:46
    and Alum Alum is used for pickling and
  • 00:00:48
    you can find it in your local grocery
  • 00:00:49
    store so although we're not dealing with
  • 00:00:51
    anything particularly dangerous today
  • 00:00:53
    it's still a good idea to wear your lab
  • 00:00:54
    coat and goggles to protect against
  • 00:00:56
    spills and splashes the first step is to
  • 00:00:59
    create some starter CST seeds which will
  • 00:01:01
    act as the starting point where our
  • 00:01:02
    larger crystals will grow from Begin by
  • 00:01:05
    filling your glass half full of hot
  • 00:01:13
    water next add a bunch of Alum to your
  • 00:01:21
    water stir Your solution until all the
  • 00:01:24
    Alum has been dissolved into the
  • 00:01:27
    water continue to add small portions of
  • 00:01:30
    Alum to your water and mix it in until
  • 00:01:32
    the Alum stops dissolving in the water
  • 00:01:34
    this will be apparent when some of the
  • 00:01:36
    alum powder remains at the bottom of the
  • 00:01:39
    glass place a paper towel or coffee
  • 00:01:42
    filter over the glass and leave it in a
  • 00:01:44
    room or cupboard where it won't be
  • 00:01:46
    disturbed so it can cool let the glass
  • 00:01:48
    sit until you have a large enough seed
  • 00:01:50
    Crystal at the bottom of the glass to
  • 00:01:52
    tie a fishing line around this process
  • 00:01:55
    can take a few hours or up to a few days
  • 00:01:57
    to
  • 00:01:58
    complete once you think you have a large
  • 00:02:00
    enough seed Crystal pour the liquid into
  • 00:02:02
    a new cup and remove the largest seed
  • 00:02:04
    Crystal take your seed Crystal and
  • 00:02:07
    tightly tie the fishing line around it
  • 00:02:09
    be careful not to break your seed
  • 00:02:10
    Crystal tie the other end of your
  • 00:02:12
    fishing line around the popsicle
  • 00:02:15
    stick reheat Your solution in a
  • 00:02:18
    microwave then add all the extra
  • 00:02:21
    crystals back into the hot water and mix
  • 00:02:23
    it until all the crystals have been
  • 00:02:24
    dissolved rest the popsicle stick across
  • 00:02:27
    the top of the glass so that the crystal
  • 00:02:29
    is in the middle mid of the liquid and
  • 00:02:30
    not touching the bottom or any of the
  • 00:02:32
    sides leave your Crystal to grow a few
  • 00:02:34
    days after a few days if there are
  • 00:02:37
    crystals accumulating on the bottom of
  • 00:02:38
    the glass remove your large Crystal that
  • 00:02:40
    is attached to the stick from your
  • 00:02:42
    solution reheat Your solution in the
  • 00:02:44
    microwave and stir it until all the
  • 00:02:46
    crystals have been dissolved you can add
  • 00:02:49
    any extra Alum you have at this stage to
  • 00:02:51
    increase how large your Crystal will
  • 00:02:53
    grow repeat this step until there are no
  • 00:02:55
    more crystals growing on the bottom of
  • 00:02:57
    your glass once you're done growing your
  • 00:02:59
    crystals remove it from the water let it
  • 00:03:01
    dry and you will now have your very own
  • 00:03:04
    Alum Crystal formation let's look at
  • 00:03:06
    this experiment a little closer all
  • 00:03:08
    liquids have a set solubility to a
  • 00:03:10
    specific substance at room temperature
  • 00:03:13
    some liquids have high solubilities
  • 00:03:15
    others have low solubilities solubility
  • 00:03:18
    is the amount of a particular substance
  • 00:03:20
    that can be dissolved into a specific
  • 00:03:21
    liquid as the temperature of a liquid
  • 00:03:24
    increases the solubility also increases
  • 00:03:27
    in our experiment our water's
  • 00:03:28
    temperature is much higher than room
  • 00:03:31
    temperature this means that the amount
  • 00:03:33
    of Alum we can dissolve into the water
  • 00:03:35
    is much greater than if the water was at
  • 00:03:37
    room temperature this creates a super
  • 00:03:40
    saturated solution super saturated
  • 00:03:42
    Solutions are solutions that have a
  • 00:03:44
    higher solubility than what the liquid
  • 00:03:46
    could normally handle when we leave our
  • 00:03:48
    Solution on the Shelf the temperature of
  • 00:03:51
    our solution slowly drops back down to
  • 00:03:53
    room temperature as the temperature
  • 00:03:55
    drops the maximum solubility of the
  • 00:03:57
    water drops as well this leads to our
  • 00:03:59
    solution releasing molecules of Alum and
  • 00:04:02
    these molecules form a solid precipitate
  • 00:04:05
    as our solution gets cooler and cooler
  • 00:04:06
    it releases more and more Alum
  • 00:04:09
    molecules these Alum molecules
  • 00:04:12
    accumulate at the bottom of our glass
  • 00:04:13
    and create Crystal formations the thing
  • 00:04:15
    about Alum molecules is that they would
  • 00:04:18
    rather attach to an existing Alum
  • 00:04:19
    molecule or Crystal formation rather
  • 00:04:22
    than starting a new one this is proven
  • 00:04:24
    when we add our seed Crystal to our warm
  • 00:04:26
    solution and as the solution cools the
  • 00:04:28
    precipitated Alum molecules attached to
  • 00:04:31
    the seed Crystal over and over again to
  • 00:04:33
    create a large Crystal formation this
  • 00:04:36
    process is called crystallization the
  • 00:04:38
    shape of the crystal is specific to the
  • 00:04:40
    substance different substances like
  • 00:04:42
    sugar or salt will create Crystal
  • 00:04:43
    formations of different shapes we will
  • 00:04:46
    be exploring the shapes of different
  • 00:04:47
    Crystal substances and how to create
  • 00:04:50
    them in future
  • 00:04:52
    episodes so that was how to grow your
  • 00:04:53
    own Crystals at home using
  • 00:04:55
    crystallization I hope you enjoyed it
  • 00:04:56
    and remember to comment and subscribe
  • 00:04:58
    Down Below on YouTube YouTube and make
  • 00:05:00
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    like and if you have any questions
  • 00:05:05
    related to this experiment or if you're
  • 00:05:06
    having trouble in school with science
  • 00:05:08
    feel free to ask us any question you
  • 00:05:10
    want and we'll be more than happy to
  • 00:05:11
    help you answer it thanks for watching
  • 00:05:13
    thanks bye the commander will be
  • 00:05:16
    pleased here at SAU we're always curious
  • 00:05:19
    how experiments turn out so if you do
  • 00:05:21
    these experiments at home record them
  • 00:05:23
    and submit them to us as a video reply
  • 00:05:25
    to this video but remember always get
  • 00:05:28
    your parents permission before you
  • 00:05:29
    submit any videos to YouTube
Tag
  • Crystallization
  • S Guys
  • Alum
  • Science Experiment
  • Crystal Growth
  • Solubility
  • Home Experiment
  • DIY Science