pH Indicator made from Red Cabbage - Acid / Base Science at Home

[@BealsScience]

I hope you are well and staying healthy! With the school closures, I've been doing science experiments at home with my own children so I've decided to focus on making videos during this time of COVID to help you do science at home. I've got some big projects/builds for KZbin that are currently on hold but they will be back - in the meantime, we get to 'play' with smaller experiments at home. Thank you for watching! Craig Beals

[@alienwizard3695]

Please make a video that display the difference in viscosity and surface tension when the temperature of a liquid is changed, I really like fluid dynamics.

[@BealsScience]

Does viscosity and surface tension of Mercury change with temperature? I've got a LOT of Mercury to do some experimenting with!

[@alienwizard3695]

@@BealsScience Due to Mercury's expansion/contraction to temperature changes my guess is that it would be A great candidate for some experiments, but I really don't know.That's A great question Sir. Some newtonian fluids may also be good candidates. If you have A hyperbaric chamber you can also test how atmospheric pressure affects viscosity and surface tension.

[@alienwizard3695]

My favorite part of this video is that you show how acidic some sodas are. I like how straight forward you are with your explanations, I wish I had A science teacher like you when I was in school.

[@BealsScience]

Thank you for the kind words!

[@alienwizard3695]

@MARVIN PETION This is A Science channel dude, NOVUS ORDO SECLORUM.

[@송치원-s6j]

I'm watching this video at Korea. I think your voice is so good to concentrate. I've never thought about making red cabbage pH Indicator at home... so impressive!

[@BealsScience]

Thank you!!

[@interestingeveryday2859]

Great Video! This is the way Chemistry should be taught, by something relevant and tangible.

[@BealsScience]

Thank you!

[@MathGaga]

I eat raw cabbage especially if I have an upset stomach, cabbage cures it in 5 minutes. Next day I feel great too. I tested it cabbages pH level is about 7.5 I believe.

[@BealsScience]

Thanks for watching and commenting!

[@douggiles7647]

Just a heads-up that it started turning blue right away from your tap water, either from the chlorine/chloramine or hard water. I know that because the same thing happens to me unless I make it with RO or distilled water, then it stays the nice purple/violet like it should be at neutral. Doesn't really matter if you're just doing it for fun but if you need it fairly accurate like I do then it's something to keep in mind. I know that RO/distilled is usually less than 7 (if you can measure it all) but with no buffering capacity it should swing straight to the pH of the cabbage.

[@BealsScience]

Thanks!

[@EdwardTriesToScience]

I was going to make a video on this, and I still will later, but you beat me to it. I have found that if you leave a pH 14 litmus solution for a while, it turns yellow. And a more efficient way I prefer is by boiling the cabbage, which can leach all the litmus out of a cabbage. *For everyone that is trying this, avoid keeping a bottle of it, unless you keep it in the fridge and/or, preserve it with 5 ml of alcohol, example: denatured alcohol.*

[@feartheoldbllood]

HELLO MR BEALS SCIENCE MR PEANUTBUTTER HAS RETURNED AFTER 3 YEARS AND YOUR CONTENT IS STILL AS AMAZING AS EVER

[@BealsScience]

Where did Mr Peanut Butter go?? Thank you for the kind words!

[@PuudingMusic]

Well dayn, this video taught me something that took me half a month to learn

[@BealsScience]

Thank you!

[@Sthitadhi1]

Awesome work! 👍 Thanks for sharing.

[@BealsScience]

Thank you for the kind words!

[@tomh2628]

Wait then how is baking soda alkaline when it has no OH groups?

[@BealsScience]

That is a great question! Let me do my best to try to answer it: Baking Soda, sodium bicarbonate, is a weak base (causes OH- to form) but it can also act as an acid (causes some H+ to form...bear with me). When sodium bicarbonate dissolves in water is will hydrolyze some of the water molecules, this means it will break up the H2O into H+ and OH-. Some of the H+ ions re-attach to the bicarbonate (so they are no longer 'freely' floating around in the solution) but many of the OH- ions remain floating around, not attached to anything. Since more OH- are left in the solution than H+, it is slightly basic. Does that help?

[@tomh2628]

Thanks

[@TheWildDryad]

very cool video! I wonder with this same concept if it would be possible to soak this cabbage solution in coffee filters to make diy ph test strips!

[@BealsScience]

That is a great idea! I haven’t tried anything like that but it definitely seems possible!

[@SushanthReddy29]

Can you try to make mini particle accelerator

[@rebeccasheridan2657]

Lol

[@BealsScience]

I would love to do that! Any suggestions on a plan for a starting point? I might have to team up with an electrical engineer to make it operational - they are pretty complex, aren't they?

[@SushanthReddy29]

It's fun and no need to a make complex one try making a simple one

[@joeaverage8329]

Awesome video!

[@BealsScience]

Thank you!

[@rebeccasheridan2657]

I Hate Cabbage But I Love Chemistry

[@BealsScience]

If you don't like cabbage, the smell of the cabbage indicator might put you over the edge!! But...it is worth it - believe me! Thanks for watching!

[@shristioni784]

Wow great 👍

[@BealsScience]

Thanks!

[@futbul4eva]

Hi, what were the liquids in the rainbow at the end in order? I need it for a science project at school. Thanks! Great video btw

[@insaneo4430]

Is it safe to drink the red cabbage indicator liquid?

[@BealsScience]

The cabbage juice is safe to drink but do not drink any of the mixes unless the liquid you mixed with the cabbage juice is safe to drink (in other works, don’t drink the bleach!).

[@colleenforrest7936]

But... Why 14? Okay, since you have 0, it's actuly 15 units. Is it because it's one less than 16? A sort of n-1 situation? Is this a combitoric of 8 objects with 2 possible states each? 2(n-1) = 2(8-1) = 14? But then... Why 8?

[@BealsScience]

Are you wondering why the scale goes from 0 - 14? If so, let me try to answer: The scale is based on the concentration of hydrogen ions in solution. So, at pH 0, the concentration of H+ ions (moles/liter) is 1x10^0 (or 1.0 moles/liter of hydrogen ions). At the other end of the scale there are very few hydrogen ions present and a lot of OH- ions present. So, at pH 14, the concentration of H+ ions is 1x10^-14 (or 0.00000000000001 moles/liter of hydrogen ions). So, you might hear people say that you can have a pH less than zero and more than 14 which is true! The concentration of H+ ions would just need to be outside of the numbers I shared above. These concentrations are rare but do exist. I hope that helps!

[@colleenforrest7936]

@@BealsScience Thanks!

[@Ahmed-q4x3d]

U are the best

[@BealsScience]

Thank You!!!

[@Ahmed-q4x3d]

@MARVIN PETION shut up idc

[@Tudumanu]

nice!!

[@BealsScience]

Thank you!

[@AmyWolek]

Hello! I'm wondering how/why your hot water appears white in this video. Did you add something to it?

[@BealsScience]

It appears white because my faucet aspirates the water so it has a lot of little bubbles. The bubbles dissipate fairly quickly then it is clear. This is just due to the design of the faucet - it is a water saving faucet.

[@Abstrxkt]

*hahhaha* lol when he explained in 30 sec it was actually 1 min or something( no hate) i enjoyed your channel

[@BealsScience]

😉

[@T__GRH]

Will this work if I put pool water?

[@BealsScience]

I’ve never tested pool water. If you try it, let me know how it works out!

[@joyceannspremulli1602]

general

[@misterwhyte]

Great video! If the cabbage can give us red and blue hues, are there other ingredients that could give us other colors?

[@BealsScience]

Yes, definitely! Some natural food dues will only make certain colors with different pH but you should be able to make the whole spectrum if you use several different plants.

[@misterwhyte]

@@BealsScience Thanks for replying! Do you have any examples of edible foods that give other colors? The only other one I found so far is butterfly pea tea, but it gives similar hues to red cabbage.

[@BealsScience]

@@misterwhyte I haven’t tested a lot of foods but I know that red beets, dragonfruit, and blueberries work as well.

[@misterwhyte]

@@BealsScience Thanks for the reply. I'll check these out!

[@CraigBeals]

@@misterwhyte Let me know how they turn out!

[@LucyMorgan-h9k]

What makes it yellow

[@aeziy1818]

i like lemons

[@BealsScience]

Me too!

[@sherrysunshine6986]

Just a reminder to viewers bleach and vinger do NOT mix, the fumes are toxic and can kill you.

[@BealsScience]

Thanks for the reminder!

[@sherrysunshine6986]

@@BealsScience Thanks for the video, It was informative and helped me test my sick puppy's pH pads to see if they would actually work!

[@BealsScience]

@sherrysunshine6986 glad I could help!!

[@cukoobajube]

Informative but the music is horrible. Thank you.

[@BealsScience]

👍

[@pierreuntel1970]

That's not 30s, lol

[@BealsScience]

HA! You got me! I tried to do it in 30 seconds about 20 times - so, instead...I just fixed the clock to work in my favor...