Make Potassium Chromate and Dichromate from Chromic Oxide

[@teresashinkansen9402]

This is one of the best synthesis of chromate/dichromate Ive seen so far. Thanks!

[@196Stefan2]

Thank you! I didn't know before, that the conversion of Chromate into Dichromate even works well with a weak acid like Acetic Acid, which is much more easier to get rid-off than Sulphuric Acid.

[@foc2241]

4:29 I love the sparkling😍 nice video👍🏼

[@user-eh2se3rb5f]

Great Video!

[@benjaminpainter378]

Wow! This is an amazing video. Thank you for the time and effort in making this

[@pyroaxcry]

Could I use 50% sulfuric acid instead of glacial acetic acid ? Thanks !

[@pyrofriends2323]

It depends of the temperature you hit the mix. If you heat further, KNO2 can be reduced to K2O or decomposed.

[@shawnsskits3885]

Great video. Would Chromate to Dichromate be an endothermic reaction?

[@jamesg1367]

Very nice demo! Are there other acids that can work for this purpose in place of acetic acid?

[@Shivachemist]

Most common acids will work. Acids such as Oxalic acid, Hydrobromic acid, Hypophosphorous acid should not be used for dichromate conversion as these acids are reducing agents. To prepare a pure dichromate salt, the corresponding acid should be used. Chromium trioxide (anhydride of chromic acid) in this case. Having said that, it is okay to use other acids for aqueous chemistry of Chromium.

[@jamesg1367]

@@vibzzlab Thanks!

[@jamesg1367]

@@Shivachemist Now you've done it. Next I'll be making CRO3 in my garage!

[@LiborTinka]

@@vibzzlab yes but it's advantageous to choose acid so that the resulting salt easily separates from the dichromate product by filtration, i.e. you want a salt that has different solubility compared to the dichromate

[@juzeralirangwala3539]

Avoid HCL because conc HCl reacts with dichromate to liberate chlorine

[@bilalkhalid9269]

Hello sir How to make sodium chromate or sodium dichromate please share the video

[@chanduch7183]

Super nice

[@SciDOCMBC]

well done 👍

[@SciDOCMBC]

@@vibzzlab yes, I do, especially coz I love Potassium dichromate because of it's beautiful orange colour ( I know it's toxic and carcinogenic), but you also explained it very well and above all understandably, unfortunately not everyone has this ability here on KZbin, thanks

[@chetanasrivoleti4968]

Awesome

[@javier6489]

Thank you friend

[@kuravax]

Hi, i have a question: which was the final yield of the potassium dichromate, cuz a synthesis i attempted following a similar technique gave out i think ~20% of the theoretical yield, the potassium chromite had formed in the cup which didnt oxidise till 6valent chromium

[@kuravax]

vibzz lab i used k2co3, kno3 and cr2o3 i think

[@kuravax]

vibzz lab i am more interested bout the yield your process gave, cuz im planning to do it again and currently thinking which method to use

[@mecmax1583]

you good man

[@PaulSt-Germain-c7u]

How many grams of K2Cr2O7 did you get?

[@monokeras8050]

This is certainly a handy way to prepare potassium (bi)chromate in the countries in which, like Europe, 30% hydrogen peroxide trade is restricted. However, I'd be also interested in collecting the resulting KNO₂ which is a nice reducing agent. What happened to it? It stayed in solution? Isn't your final product contaminated with it?

[@monokeras8050]

@@vibzzlab Nice! I’m interested in KNO₂, if only to synthesise diazonium compounds (like you did!) Also, TBH, I’m a bit concerned with the way you put those strong oxidisers over paper towel to dry them. CrO₃ is usually considered unsafe to filter using gravity filtration because it would oxidise paper filter. I don’t think any Cr (VI) compounds are really safe to handle with paper, I would use a Buchner funnel here, really.

[@monokeras8050]

@@vibzzlab Yeah, I had guessed so. You have an impressive collection of reactants, though. Also kudos for your video, and kudos for your English explanations!

[@chanduch7183]

Red Daicromet 100, grm How much price mani please Ripley

[@dumbdog3396]

is it possible to use regular acetic acid or HCl to convert the chromate to dichromate in the last step ?

[@dumbdog3396]

@@vibzzlab cheers , thanks for the video, not many out there on this process

[@juzeralirangwala3539]

HCL cannot be used because dichromate is strong oxidising agent it will liberate chlorine if HCL is too concentrated....... Dilute Acetic acid being weak acid wouldn't lower the pH enough so as to convert chromate into dichromate hence best option is either glacial acetic acid or sulphuric acid....... Equilibrium between chromate and dichromate depends on pH as per lechateliers principle equilibrium would be driven to dichromate side at higher Hydrogen ion conc or lower pH

[@joeylo2302]

1:53 Forbidden green cream.

[@copperchopper4626]

from where did you get KNO3?

[@copperchopper4626]

@@vibzzlab oh ok

[@SleepyHollow2020]

how about using sodium nitrate instead of potassium nitrate and sodium hydroxide instead of potassium hydroxide

[@user-eh2se3rb5f]

you would get sodium dichromate then, which is chemically similar to potassium dichromate.

[@ingolorenzo4158]

@@vibzzlab and if i just use sodium hydroxide?

[@n-n.n3248]

The equation of the chromate is unbalanced, It misses a 3 in the kno2

[@djrank019]

Hey awesome vid ! was wondering does any type of acid work on the chromate to di process ? say for instance i use citric acid which is the only one i have lying around ... And also is that step reversible making chromate from the di by using Pot Hydroxide or soduim hydroxide Also for saftey around heating the mixed chromuim nitrate and hydrox , does it produce toxic gases ? Thanks

[@teresashinkansen9402]

I don't have enough knowledge so I might be wrong but i think the purpose of using the acetic acid is that it will evaporate and not leave any leftovers meanwhile citric acid will end up in the final product.

[@djrank019]

@@teresashinkansen9402 2 Years later , i have figured it out the hard way , i made pot dichromate with chlorines and citrates contamination , but the acetic acid ones , turned out great ! Cheers mate

[@Bavarianscience]

Would this reaction also work with calcium hydroxide and calcium nitrate instead of the potassium salts?

[@ngozumpa]

You can easily convert calcium nitrate to potassium nitrate by using potassium chloride.

[@tristan795]

Can you use sodium hydroxide?

[@ingolorenzo4158]

@@tristan795 i also wondered if i coud use sodium hydroxide

[@emmepombar3328]

And where did the KNO2 go to?

[@chemistryofquestionablequa6252]

It stays in solution when you crystallize the chromate

[@indianpeople6587]

Chromium oxide green processing video sent sir please thank you sir

[@saifulbakri5993]

berapa nilai standar termodinamic Na2Cr2O7.2H2O

[@yu-od8jy]

うまそう

[@hariprasadts4118]

Hlo vibin bro...its me Hari...I lost ur contact as I reseted my device ....message mw