The oxygen is dissolved in the solution; hence the methylene blue causes the solution to turn blue. As the reaction proceeds, the oxygen is consumed in the reaction as glucose is oxidised to form carbon dioxide and water and hence the solution goes colourless. As you reshape the flask, you dissolve more oxygen back into solution turning the solution blue again

@block1086

7 жыл бұрын

Nicholas Sanders

@minecraft_0386

5 жыл бұрын

The explanation was quite helpful to me. Thanks a lot

@couldntthinkofausername8411

5 жыл бұрын

I’m doing a worksheet on this video and your answer just saved us 5 minutes

@ilenelaugen5061

4 жыл бұрын

thank you for helping me with my science project

@rinckeric4741

3 жыл бұрын

so finally three is no oxygen in the enclosed flask,right?

good presentation....really

How much of the materials are required?

Does table sugar work too?

Great job 👌👍👍

Can we use any Base beside koh

It works

Can we use caustic soda

This is not an equilibrium as Glucose in not reformed. By shaking the bottle you just help dissolve more oxygen (one of the reactants) in water. Since gases have very low solubility in water, only a small amount of oxygen may be in the solution at any time, it is consumed fast due to the catalyst and the color dissapears. Shaking speeds up the entry of more oxygen to the water, as if left to disolve while in calm it would react as soon as it disolved. Nice experiment but no equilibrium here, if only production of Glucose was that easy.

What can I substitute glucose and potassium hydroxide with?

From where we can buy these things

La profe nos mando a ver este video,esta buenísimo jajajs gracias me salvaron de hacer el experimento :D

Catalytic oxidation oxidation of glucose??? Is it the reduction of methylene blue by glucose in strong alkaline condition? when the flask was shaken, the oxygen in such system can re-oxidise the colorless form of reduced methylene blue to blue color???

What if we add phenol red along with methylene blue?

can we use any other thing for methalyne blue

@rinckeric4741

3 жыл бұрын

methylene

If this is sealed in a jar, how many times can it turn blue and back?

@imvuglitter6370

2 жыл бұрын

forever hence why it’s equilibrium

@kishorevenugopal6191

Жыл бұрын

@@imvuglitter6370 But if Oxygen is transformed into CO2, how can it still have Oxygen to change colour?

Can we use other indicators

@globgblobgabgalab

Жыл бұрын

i dont think you can because the glucose is reducing methylene blue solution andyou wont get the same blue color as you get with methylene blue. i havent tried the experiment yet but this is just my thoughts

Fantastic♥

Danke

What kind of glucose are you using?

@dayasharma8018

5 жыл бұрын

Kean Guerra c6h12o6

@johnrhodes3350

10 ай бұрын

The white powdery type😉

😯😯😯😯Super 👌👌👌👌

HELP, question: I'm looking for a reaction where you start with color (any color is ok) and after a certain time, it becomes colorless. If possible I would like to do it with non-harmful chemicals, because it's going to be an experiment for primary school kids. -Start with a color (already set up in the container, if possible use non-harmful chemicals or natural products) -Add H2O and it becomes colorless -If possible, change the time it takes to become colorless based on the concentration of the initial chemicals/products -Use natural products or non-harmful chemicals, as it is an experiment for kids, primary school students. Thank you very much.

It this a reversible reaction or not plzzz reply me

@s9scrxmsy424

5 жыл бұрын

Yes

@themagiccorner7530

4 жыл бұрын

No

@russellgrant4544

3 жыл бұрын

It is not technically reversible. Methylene blue is reduced by glucose, which makes it turn colorless (called methylene white). The colorless methylene white can be oxidized back into methylene blue by oxygen. So, the methylene blue methylene white transformation is reversible in a sense. I wouldn't call it technically a reversible reaction because they are actually the result of two separate essentially irreversible reactions. The reaction between methylene blue and glucose along with the reaction between methylene white and oxygen are not reversible in this situation.

can I use NaOH in place of KOH???

@hibbahyawar1281

Жыл бұрын

yup

how long does the reaction can proceed??

@nikolaus43211

4 жыл бұрын

@@vcuberx no, only as long as there is oxygen in the system.

@rudu3298

Жыл бұрын

@@nikolaus43211 is it turning blue because the oxygen in the water?

soo is this a chemical or physical change?

@johnrhodes3350

10 ай бұрын

chemical

CoOl

Thank you so much sir

what happen it the flask was filled to the top with the solution

@donrowe101

9 ай бұрын

the driving reaction uses up oxygen (O2). when the O2 reactant is gone the reaction stops and no further color change will occur. with a fuller flask (less air, less oxygen) at the start the reaction will end sooner than when the flask contains more air, therefore more O2

🤘🏼🤘🏼🤘🏼🤘🏼🤘🏼🤘🏼🤘🏼🤘🏼🤘🏼🤘🏼🤘🏼

I don’t understand why this is equilibrium... 😓

@taod01

4 жыл бұрын

It’s in a closed system and so the backwards reaction is the same as the forwards reaction

From Bangladesh.....

@juvnchy

4 жыл бұрын

Maruf Ahmad cool

Please give chemical equation for this reaction

@noxusfumes3628

4 жыл бұрын

C6H12O6 + 6O2 ==> 6CO2 + 6H2O

@nikolaus43211

4 жыл бұрын

@@noxusfumes3628 wrong. the aldehyde gets oxidised to a carbon-acid.

@noxusfumes3628

4 жыл бұрын

@@nikolaus43211 You can clearly hear him saying this himself, that glucose reacts with oxygen in air to produce CARBON DIOXIDE and not some carbon acid, at 0:28

@nikolaus43211

4 жыл бұрын

@@noxusfumes3628 and its wrong. or can you see bubbles rising from carbon dioxide like in soda?

@noxusfumes3628

4 жыл бұрын

@@nikolaus43211 You do have a point. Now I tend to believe that the evolved CO2 remains dissolved in water as carbonic acid, H2CO3. What's your take on this?

Pyar ❤️from india

Guariscimi tutto anche l aids la lebbra i tumori la leucemia la sindrome psichiatrica e l aids oids e u mi chiamo Biagio di balsamo e famiglia

Oh my God how does he talk I get so irritated!!