Why is there a difference in the colours of K₂Cr₂O₇ and K₂CrO₄?
Apr 14, 2015 · Chromate (yellow) and dichromate (orange) ion are at equilibrium in solution. The equilibrium equation can be represented by $$\ce {Cr2O7^2- + H2O <=> 2CrO4- + 2H+}$$ By Le …
What exactly is formed when K2Cr2O7 is reduced?
May 16, 2018 · The dichromate ($\ce {Cr2O7^2-}$) ions are strong oxidizing agents at low pH. During the redox process, each chromium atom in the dichromate ions (oxidation state = +6) gains three …
Why is chromate stable in basic medium and dichromate stable in …
May 21, 2020 · When I was studying the equilibrium existing between chromate and dichromate ions in the solution, I came to know that Chromate ion is more stable in basic medium while dichromate ion …
Why does balancing the oxidation of dichromate(VI) to chromium(III ...
Feb 22, 2024 · The next two lines start with "Electron transition", follow by the dichromate reduction. Here you correctly find that $6$ electrons are needed when reducing $1$ $\ce {Cr2O7^ {2-}}$ ion to …
organic chemistry - Corey-Schmidt oxidation of primary alcohols ...
Jan 24, 2016 · The Corey-Schmidt oxidation uses PDC (pyridinium dichromate) to primarily oxidise alcohols to carbonyl groups. PDC exists in the form of stable bright-orange crystals that remain …
organic chemistry - Using potassium dichromate and sulfuric acid to ...
Nov 25, 2023 · 5 We had an experiment at school to find out the biomolecules contained in the different foodstuffs. After doing Tollens’ test which turned out to be positive, our teacher instructed us to clean …
How to know dichromate is being reduced from Cr⁶⁺ to Cr³⁺?
Aug 30, 2019 · When potassium dichromate is being used as an oxidising agent, it gets reduced from chromium(VI) to chromium(III). Is there any way to know that or calculate that other than being …
Does chromium chromate — Cr₂ (CrO₄)₃ — exist?
Apr 3, 2024 · I'm not aware about the existence of chromium (III) dichromate, but dichromium bis (chromate) tetrachromate $\ce {Cr2 (CrO4)2 (Cr4O13)}$, or $\ce {Cr8O21}$ [] () does exist and is …
Dichromate in acidic medium - Chemistry Stack Exchange
Nov 2, 2016 · The formation of chromium trioxide from (sodium) dichromate in sulfuric acd is not a redox reaction. There is no partner that could be oxidized by $\ce {Cr2O7^ {2-}}$. Concentrated sulfuric …
analytical chemistry - Do both phosphoric acid and sulphuric acid ...
Apr 15, 2022 · It should also hasten oxidation by O2. Phosphoric acid is more useful using dichromate oxidant than permanganate since permanganate is its own indicator. The best way to avoid reaction …