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 …
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) …
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 …
Standardization of sodium thiosulfate using potassium dichromate
Nov 4, 2016 · In this process first we need to liberate iodine to react with sodium thiosulfate. First, sodium bicarbonate is added to a iodate-free solution of potassium iodide. The mixture is …
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 …
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 …
Standard Electrode Potentials and Galvanic Cells
Feb 9, 2025 · With galvanic cell notation Cu (s)|Cu $^2$$^+$ || Cr $^3$$^+$, Cr2O7 $^-$$^2$ |C (s) The question in my homework asked to write half equations and the overall equation and …
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 \ceCr2O72− \ce C r 2 O 7 2. …
inorganic chemistry - Is acidified dichromate (VI) capable of …
Apr 28, 2017 · Is acidified dichromate (VI) capable of oxidizing hydrogen sulfide to sulfur dioxide? Ask Question Asked 8 years, 7 months ago Modified 2 years, 9 months ago
Why does potassium dichromate always reacts in an acidic medium?
Jun 4, 2017 · On the other hand, potassium manganate reacts in both acidic and alkaline media.