Can u explain to me why there should be three equations? I knew that K2(CrO4) +2

Question

Can u explain to me why there should be three equations? I knew that K2(CrO4) +2HCL ---> 2KCl+ H2CrO4 is one of them The one written on the book is supposed to be the second one but wht and what's the third equation??? ( is it the one adding the orange solution with sodium hydride) Thus is there suppose to be a sign of precipation from chromate to dichromate?
Thank you so much 583 CHAPTER 15 Principles of Chemical Reactivity: E 68. 66. The photographs below show what occurs when a solu- tion of potassium chromate is treated with a few drops of concentrated hydrochloric acid. Some of the bright yellow chromate ion is converted to the orange dichro- mate ion. whe the nt ndlew ont orange dichro- INi 2 CrO,2 (aq) + 2 H,O (a)Cr202-(aq) +3 H20() IN (a) Explain this experimental observation in terms of Le Chatelier's principle. (b) What would you observe if you treated the orange solution with sodium hydroxide? Explain your observation. Su The 67. The photograph below (a) shows what occurs when a solution of iron(I) nitrate is treated with a few drops of vior 69. aqueous potassium thiocyanate. The nearly colorless iron(III) ion is converted to a red [Fe(H,O) SCNP ion. 69 (This is a classic test for the presence of iron(III) ions in

Explanation / Answer

Dichromate-chromate equilibrium: Predominantly Cr2O72- ions present where hydroxide ions comes from water to form again   CrO42-

Cr2O72- + 2OH- H2O + 2CrO42- (step: 3)

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